Mort, David
Gower Publishing Company, 1985
Buku Referensi
Mort, David
Gower Publishing Company, 1990
Buku Referensi
David, H.A., author
John Wiley & Sons, 1981
Buku Teks
Pieper, F. C., author
CBD Research Ltd., 1978
Buku Teks
Pieper, F. C., author
CBD Research Ltd., 1978
Buku Teks