Morris, Molly R & Michael J. Ryan. 1900. "Age at sexual maturity of male Xiphophorus nigrensis in nature". Copeia. 1990(3):747-751 (ffm01217) (abstract)
Morris, Molly R & Michael J. Ryan. 1992. "Breeding cycles in natural populations of Xiphophorus nigrensis, X. multilineatus, and X. pygmaeus". Copeia. 1992(4):1074-1077 (ffm01215) (abstract)
Morris, Molly R & Michael J. Ryan. 1995. "Large body size in the pygmy swordtail Xiphophorus pygmaeus". Biological Journal of the Linnean Society. 1995(54):383-395 (ffm01216) (abstract)
Morris, Molly R & William E. Wagner Jr, Michael J. Ryan. 1996. "A negative correlation between trait and mate preference in Xiphophorus pygmaeus". Animal Behaviour. 1996(52):1193-1203 (ffm01264) (abstract)
Morris, Molly R & Paul F. Nicoletto, Elizabeth Hesselman. 2001. "A polymorphism in female preference for a polymorphic male trait in the swordtail fish Xiphophorus cortezi". Copeia. 2003(65):45-52. DOI: 10.1006/anbe.2002.2042 (ffm01218) (abstract)
Morris, Molly R & Jason A. Elias, Jason A. Moretz. 2001. "Defining vertical bars in relation to female preference in the swordtail fish Xiphophorus cortezi (Cyprinodontiformes, Poeciliidae)". Ethology. (107):827Ð837 (ffm01219) (abstract)
Morris, Molly R & Kevin de Queiroz, Don C. Morizot, J.D. McEachran. 2001. "Phylogenetic relationships among populations of northern swordtails (Xiphophorus) as inferred from allozyme data". Copeia. 2001(1):65-81. DOI: 10.1643/0045-8511(2001)001[0065:PRAPON]2.0.CO;2 (ffm01266) (abstract)
Morris, Molly R & Ryan J. Friebertshauser, Megan Zupi, Melissa N. Liotta, Garrett Dunn, Nicole Kleinas, Oscar Rios-Cardenas. 2018. "Feeding rates in the swordtail fish Xiphophorus multilineatus: A model system for genetic variation in nutritional programming". Zebrafish. 15(5):484-491. DOI: 10.1089/zeb.2018.1624 (ffm01174) (abstract)