Helen E. Freeman

Play behaviour of a mixed group of juvenile gorillas and orang‐utans Gorilla g. gorilla and Pongo p. pygmaeus

J. Alcock, Helen E. Freeman, 1973 .

Behavior in adult pairs of captive snow leopards (Panthera uncia)

Helen E. Freeman, 1983 .

The Snow leopard Panthera uncia: a captive population under the Species Survival Plan

Helen E. Freeman, D. Wharton, 1987 .

A preliminary study of the behaviour of captive Snow leopards

Helen E. Freeman, 1975 .