edited by Fred M. Cox [and others]
FE Peacock, 1979
Buku Teks
edited by Ralph M. Kramer and Harry Specht
Prentice-Hall, 1969
Buku Teks
edited by Harold J. Burbach
Pendell, 1977
Buku Teks
Sower, Christopher
Free Press, 1957
Buku Teks
F.E. Paecock Publ, 1987
Buku Teks