Sinclair, Andrew, author
Harper & Row, 1965
Buku Teks
edited by Harold F. Williamson
Prentice-Hall, 1951
Buku Teks
Robertson, Ross M., author
Harcourt, Brace & World, 1964
Buku Teks
Kraus, Michael, author
University of Oklahoma Press, 1953
Buku Teks
Bailey, Thomas Andrew, 1902-1983, author
D.C. Health, 1983
Buku Teks