Goldstein, Dora B.
Oxford University Press, 1983
Buku Teks
Meinkema, Hannes
Contact, 1996
Buku Teks
Hall, Peter
E & FN Spon, 2000
Buku Teks
Ullmann-Margalit, Edna
Clarendon Press, 1977
Buku Teks
Pfeiffer, John E., author
Harper & Row, 1969
Buku Teks