Rosenkrantz, Walter A.
CRC Press, Taylor and Francis Group, 2009
Buku Teks
Devore, Jay L.
Brooks/Cole, Cengage Learning , 2012
Buku Teks
Mendenhall, William
Wadsworth , 1967
Buku Teks
Mendenhall, William
Wadsworth, 1969
Buku Teks
Goldman, Malcolm
Harcourt Brace World, 1970
Buku Teks