edited by Clark Tibbitts and Wilma Donahue
Prentice-Hall, 1960
Buku Teks SO
by Yoichi Okazaki [and others]
Foreign Press Center, 1990
Buku Teks SO
Hillier, Susan
Wadsworth and Cengage Learning, 2011
Buku Teks SO
edited by John Field, Ronald J. Burke and Cary L. Cooper.
SAGE, 2013
Buku Referensi
Quadagno, Jill S.
St. Martin's Press, 1980
Buku Teks SO