Cassara, Ernestt, author
Gale Research Coompany, 1977
Buku Teks
Chielens, Edward E., author
Gale Research, 1975
Buku Teks
Samarin, William J.
Holt, Rinehart and Winston, 1966
Buku Teks
Birren, Bruce, author
Academic Press, 1993
Buku Teks
Goldstein, Kenneth S.
Folklore Associates, Inc., 1964
Buku Teks