Peacock, Ronald
Harcourt, Brace and Company, Inc, 1946
Buku Klasik
Smith, Leslie, author
Macmillan, 1989
Buku Teks
Griffin, Penny, 1978-, author
Macmillan, 1991
Buku Teks
Timmermans, Felix, 1886-1947, author
Davidsfonds, 1989
Buku Teks
Nannes, Caspar H,
The Catholic University, 1960
Buku Teks