Goodwillie, Carol; Kalisz, Susan; Eckert, Christopher G. (2005). "The Evolutionary Enigma of Mixed Mating Systems in Plants: Occurrence, Theoretical Explanations, and Empirical Evidence". Annual Review of Ecology, Evolution, and Systematics. 36 (1): 47–79. doi:10.1146/annurev.ecolsys.36.091704.175539. ISSN1543-592X.
Goodwillie, Carol; Kalisz, Susan; Eckert, Christopher G. (2005). "The Evolutionary Enigma of Mixed Mating Systems in Plants: Occurrence, Theoretical Explanations, and Empirical Evidence". Annual Review of Ecology, Evolution, and Systematics. 36 (1): 47–79. doi:10.1146/annurev.ecolsys.36.091704.175539. ISSN1543-592X.