Eder, Phanor J.
New York University press, 1950
Buku Teks
Eder, Phanor J.
Oxford University Press, 1950
Buku Teks
Kempin, Frederick G
West Publishing Co, 1973
Buku Teks
edited by Michael Gorman, Paul W. Winkler
American Library Association, 1978
Buku Referensi
Haines, Charles Grove
Russell and Russell, 1959
Buku Teks