Fulmer, Robert M., author
Macmillan, 1974
Buku Teks
Edited by Arthur C. Beck, Jr., Ellis D. Hillmar
Reading, Massachusetts Addicon-Wesley Publishing , 1972
Buku Teks
Wiest, Jerome D., author
Prentice-Hall, 1977
Buku Teks
edited by Fremont A. Shull
Richard D. Irwin, 1959
Buku Teks
Champion, John M.
Richard D. Irwin, 1985
Buku Teks