Flagged in 2-5% of dissertation sections. When the same author appears in half your citations for a topic, your committee sees a literature review that stopped searching too early.
Diversify your sources — this author dominates your review.
Source concentration happens when a disproportionate number of citations in a section come from a single author or a small cluster of authors. Citing Smith (2020) five times in one paragraph—or ten times in one section—tells your committee that you found one clear, quotable source and leaned on it instead of reading widely. Even if Smith is the leading expert, your literature review needs to show that you know the full landscape, not just one corner of it.
This is especially common with textbook-style sources. When students find a comprehensive handbook or literature review that covers their topic well, they cite it repeatedly instead of tracking down the primary sources it references. Your committee reads this as intellectual laziness—not because the source is bad, but because a doctoral literature review demands that you engage with primary research, not rely on someone else's summary of it.
The fix isn't to stop citing your best sources—it's to supplement them. If Smith (2020) is your primary source on teacher burnout, also cite the researchers Smith references: the original studies, the competing perspectives, the replications. Your section should demonstrate that you know Smith's work, Jones's critique, Lee's extension, and Patel's meta-analysis. That breadth of citation is what separates a doctoral literature review from a graduate course paper.
Over-reliance on a single source suggests a narrow literature search and weakens the breadth of your review.
Students find one author who writes clearly about their topic and lean on that author heavily.
Each paragraph should ideally draw from multiple sources. If one author dominates, actively seek supporting or contrasting evidence from other scholars.
Cullen (2020) found... Cullen (2020) argued... Cullen (2020) suggested... Cullen (2019) noted...
While Cullen (2020) focused on X, Smith (2019) found Y, and Jones (2021) added Z.
Four citations of the same author replaced with a broader evidence base while still crediting the foundational work.
Teacher burnout is caused by workload (Maslach, 2003). Burnout leads to depersonalization (Maslach, 2003). The Maslach Burnout Inventory measures three dimensions (Maslach, 2003). Burnout can be prevented through organizational interventions (Maslach, 2003).
Teacher burnout is caused by a combination of workload, emotional demands, and organizational factors (Maslach, 2003). Subsequent research has identified depersonalization as a key mediating variable (Skaalvik & Skaalvik, 2017), while meta-analytic evidence suggests organizational-level interventions are more effective than individual coping strategies (Iancu et al., 2018).
Reliance on a single methodology textbook diversified with seminal sources for each concept.
Creswell (2018) recommended qualitative approaches. Creswell (2018) defined phenomenology as... Creswell (2018) described data saturation as... Creswell (2018) outlined member checking procedures...
Qualitative researchers recommend multiple approaches for studying lived experiences (Creswell & Poth, 2018; Moustakas, 1994). Phenomenological inquiry, as distinct from other qualitative traditions (van Manen, 2016), focuses on the essence of participants' experiences. Data saturation (Guest et al., 2006) and member checking (Lincoln & Guba, 1985) ensure the trustworthiness of findings.
Single-author dependency expanded to show the intellectual lineage and development of the concept.
According to Gay (2018), culturally responsive teaching involves... Gay (2018) argued that... Gay (2018) further stated...
Culturally responsive teaching, as conceptualized by Gay (2018), involves validating students' cultural identities as assets for learning. This framework has been extended by Paris and Alim (2017) through culturally sustaining pedagogy and operationalized in classroom research by Ladson-Billings (2014) and Hammond (2015).
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