edited by Joseph F. McCloskey, Florence N. Trefethen
John Hopkins Press, 1954
Buku Teks
Budnick, Frank S.
Richard D. Irwin, 1977
Buku Teks
Russell, Roberta S.
Pearson Education, 2003
Buku Teks
American Management Assosiation, Inc. (c.1958), 1958
Buku Teks
Miller, David W.
Prentice-Hall of India, 1973
Buku Teks