Roy, Sister Callista, author
Appleton & Lange, 1999
Buku Teks
Roy, Sister Calista, author
Prentice Hall Prentice Hall , 1976
Buku Teks
Roy, Sister Callista, author
Prentice-Hall, 1984
Buku Teks
Lipson, Leslie, author
Vakils, Feffer and Simons Private, 1964
Buku Teks
McClelland, David C. (David Clarence), author
Feffer and Simons Private , 1961
Buku Teks