Weideman, Hugh
Thomas Y. Crowell Company, 1958
Buku Referensi
edited by John A. Wolter and Ronald E. Grim
Library of Congress, 1977
Buku Referensi
Sriro, Andrew I., author
Equinox Publishing, 2006
Buku Teks
Sriro, Andrew I., author
Equinox Pub., , 2005
Buku Referensi
Sriro, Andrew I., author
Equinox Pub, 2006
Buku Referensi