Neukrug, Edward S., author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Cammack, Paul Anthony, author
Macmillan, 1993
Buku Teks
Monsen, R. Joseph, author
Houghton Mifflin, 1967
Buku Teks
Ethridge, Marcus E., author
Wadsworth, 2010
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
W. Van Hoeve, 1954
Buku Teks