TY  - BOOK
AU  - Bullough,William Sydney
TI  - Vertebrate reproductive cycles
U1  - 596 
PY  - 1961///
CY  - London
PB  - Methuen
KW  - Vertebrates
KW  - Physiology
KW  - Zoology
N1  - First published in 1951 under title: Vertebrate sexual cycles; Includes bibliographical references
ER  -