McMenemy, David, author
Facet, 2009
Buku Teks
Eckstein, Otto, author
Prentice-Hall, 1967
Buku Teks
Aronson, J. Richard, author
McGraw-Hill , 1985
Buku Teks
Bernays, Edward L., author
University of Oklahoma Press, 1952
Buku Teks
Lutz, Harley Leist, author
D. Appleton-Century, 1947
Buku Teks