Bowers, Fredson, author
St. Paul's Bibliographies, 1986
Buku Teks
Shaw, Gareth, author
Leicester University Press, 1988
Buku Referensi
Rogers, Everett M., author
The Free Press, 1994
Buku Teks
edited by Maurice Duke, Jackson R. Bryer, and M. Thomas Inge
Greenwood Press, 1983
Buku Referensi
Larsen, Knud, author
Unesco, 1953
Buku Teks