Muchinsky, Paul M.
Wadsworth, 2000
Buku Teks
Aamodt, Michael G.
Wadsworth and Cengage Learning, 2013
Buku Teks
Aamodt, Michael G.
Cengage Learning, 2016
Buku Teks
edited by Bruce E. Leach
Academic Press, 1983
Buku Teks
Raykov, Tenko
Routledge, Taylor & Francis Group, 2008
Buku Teks