Douglas, William O., author
Doubleday, 1953
Buku Teks
Williams, Maslyn, author
William Morrow, 1965
Buku Teks
Peter H. Raven
McGraw-Hill, Higher Education, 2008
Buku Teks
Mader, Sylvia S., author
McGraw-Hill , 1998
Buku Teks
Case, James F., author
Macmillan, 1979
Buku Teks