Walker, Kath
My people / Kath Walker
The Jacaranda Press, 1981
 Buku Teks
Nowak, Ronald M.
Walker's primates of the world
The Johns Hopkins University Press, 1999
 Buku Referensi
Whiting, Percy H.
The five great rules of selling / Percy H. Whiting
Dale Carnegie & Associates, Inc., 1979
 Buku Teks
Ansell, Rod
To fight the wild/Rod Ansell, Rachel Percy
Currency Press,, 1986
 Buku Teks
Sykes, Percy Molesworth
A history of Persia / by Brigadier-General, Sir Percy Sykes.
Macmillan and co., limited, 1930
 Buku Teks
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