Yoder, Dale
Prentice-Hall, 1962
Buku Teks
Moore, Wilbert E. (Wilbert Ellis)
Macmillan, 1955
Buku Teks
Johnson, Rossall James, 1917-
[publisher not identified], [date of publication not identified]
Buku Teks
Gitlow, Abraham L.
Richard D. Irwin, 1957
Buku Teks
Moore, Wilbert E. (Wilbert Ellis)
Macmillan, 1957
Buku Teks