compiled by David Mort and Leona Siddall
Gower, 1985
Buku Referensi
Pieper, F.C.
CBD Research, 1978
Buku Teks
Pieper, F.C.
CBD Research, 1978
Buku Teks
McClave, James T.
Dellen Publishing, 1979
Buku Teks
Hays, William Lee, 1926-1995
Harcourt Brace Colege, 1994
Buku Teks