Arenson, J. T.
J.J. Groen & Zoon N.V., 1953
Buku Teks
Eder, Phanor J., author
New York University press, 1950
Buku Teks
Eder, Phanor J., author
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