Corwin, Edward S., author
Holt, Rinehart and Winston, 1964
Buku Teks
Scaros, Constantinos E., author
Jones and Bartlett Publishers, 2011
Buku Teks
The Manager of Publications, 1949
Buku Teks
Lewis, William Draper, author
Michie, 1937
Buku Teks
Fenn, Percy T., author
D. Appleton-Century, 1948
Buku Teks