Langdon 1997. Langdon, John H. (1997). "Umbrella hypotheses and parsimony in human evolution: a critique of the Aquatic Ape Hypothesis". Journal of Human Evolution. 33 (4): 479–494. doi:10.1006/jhev.1997.0146. PMID9361254.
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Langdon 1997. Langdon, John H. (1997). "Umbrella hypotheses and parsimony in human evolution: a critique of the Aquatic Ape Hypothesis". Journal of Human Evolution. 33 (4): 479–494. doi:10.1006/jhev.1997.0146. PMID9361254.
Bender R, Tobias PV, Bender N (2012). "The Savannah hypotheses: origin, reception and impact on paleoanthropology". Hist Philos Life Sci (Historical article). 34 (1-2): 147–84. PMID23272598.