Putnam, Emily James, author
Univesity of Chicago, 1970
Buku Teks
edited by Colin Thiele and Ian Mudle
Rigby, 1970
Buku Teks
Baxter, James K., author
Oxford University Press, 1981
Buku Teks
Watson, Barbara Bellow
Norton, 1964
Buku Teks
Nieva, Veronica F.
Praeger, 1981
Buku Teks