Zwarensteyn, Hendrik, author
Deventer, 1970
Buku Teks
Farnsworth, E. Allan, author
Oceana Publication, 1983
Buku Teks
Calvi, James V
Prentice-Hall, 1997
Buku Teks
Corwin, Edward S., author
Princeton University press, 1958
Buku Teks
edited with an introduction by Ralph H. Gabriel
The Liberal Art Press, 1953
Buku Teks