Sheldon, B. (1994). SPERM COMPETITION IN THE CHAFFINCH - THE ROLE OF THE FEMALE.
Chicago-viite (17. p.)Sheldon, B. SPERM COMPETITION IN THE CHAFFINCH - THE ROLE OF THE FEMALE. 1994.
MLA-viite (9. p.)Sheldon, B. SPERM COMPETITION IN THE CHAFFINCH - THE ROLE OF THE FEMALE. 1994.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.