Benet, William Rose, author
Thomas Y. Crowell, 1965
Buku Referensi
edited with introductions by Michael Bromley, Tom O'Malley
Routledge , 1997
Buku Teks
Fjeldstad, Mary C., author
Harcourt Brace College Publisher, 1998
Buku Teks
David J. Whittaker
Routledge, 2001
Buku Teks
edited by Kenneth G. Elzinga
Harper & Row, 1972
Buku Teks