Walker, Theodore D.
Plan graphics/ Theodore D. Walker, David A Davis
Van Nostrand Reinhol, 1990
 Buku Teks SO
Willer, David
Building experiment: testing social theory / David Willer, Henry A. Walker
Standford University Press, 2007
 Buku Teks SO
Bethell, Zillah
The Song Walker
Bhuana Ilmu Populer, 2023
 Buku Teks SO
Bethell, Zillah
The Song Walker
Bhuana Ilmu Populer, 2023
 Buku Teks
Nowak, Ronald M.
Walker's primates of the world
The Johns Hopkins University Press, 1999
 Buku Referensi