Lippincott, Isaac, author
Appleton Century Croffs, 1933
Buku Teks
Stebbins, Richard P., author
Harper & Row, 1963
Buku Teks
edited by Richard L. Watson
The Free Press, 1968
Buku Teks
Buchanan, Albert Russell, author
Harper & Row, 1964
Buku Teks
Buchanan, A. Russell, author
Harper & Row, [c1964]
Buku Teks