Griffith, Ernest
Frederick A. Praeger, 1954
Buku Teks
Starling, Grover, author
The Dorsey Press, 1982
Buku Teks
Kendall, Willmoore, author
Louisiana University Press, 1970
Buku Teks
McKenna, George, author
McGraw-Hill, 1998
Buku Teks
Shea, John C.
St. Martin's Press, 1984
Buku Teks