University press, 1980
Buku Teks
Delaet, Debra L., 1968-, author
Cengage Learning, 2015
Buku Teks
Lamchek, Jayson S., author
Cambridge University Press, 2019
eBooks
Delaet, Debra L., 1968-, author
Thomson Wadsworth, 2006
Buku Teks
North-South Institute , 1993
Buku Teks