Peacock, Ronald
Harcourt, Brace and Company, Inc, 1946
Buku Klasik
Lamm, Martin
Norwood Editions,, 1977
Buku Teks
Smith, Leslie, author
Macmillan, 1989
Buku Teks
Nannes, Caspar H,
The Catholic University, 1960
Buku Teks
Krasner, David, 1952-, author
Wiley Balckwell, 2016
Buku Teks