Olson, Everett C., author
Charles E. Merrill, 1975
Buku Teks
Pilbeam, David, author
Funk and Wangnalls, 1970
Buku Teks
edited by Louise B. Young
Oxford University Press, 1970
Buku Teks
Huxley, Julian, author
New American Library, 1957
Buku Teks
Starr, Cecie, author
Thomson, 2004
Buku Teks