. Effects of amount of food reinforcement on fixed-interval-induced attack in pigeons . I t g a: o Q. O OH °-

---

Size: 2869px × 1742px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., boo, bookcentury1900, bookcollectionamericana, booksubjectpigeons