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Graham, Sean P.; Earley, Ryan L.; Hoss, Shannon K.; Schuett, Gordon W.; Grober, Matthew S. (November 2008). "The reproductive biology of male cottonmouths (Agkistrodon piscivorus): Do plasma steroid hormones predict the mating season?". General and Comparative Endocrinology. 159 (2–3): 226–235. doi:10.1016/j.ygcen.2008.09.002. ISSN0016-6480. PMID18823979.