Andrews, Donald H., author
McGraw-HIll, 1974
Buku Teks
Gross, M. Grant, author
Prentice-Hall, 1972
Buku Teks
edited by Sidney Mailick; The United Nations Institute for Training and Research
Anchor Press, 1974
Buku Teks
Simpson, George Gaylord, author
Harcourt Brace & World, 1964
Buku Teks
Davis, William S., author
Addison-Wesley, 1987
Buku Teks