Masson, VeNeta
Springer Publ ., 1981
Buku Teks
edited by Howard Newby
John Wiley & Sons, 1978
Buku Teks
Olson, William Clinton, author
Prentice Hall International, 1994
Buku Teks
Messel, H., author
Pergamon Press, 1979
Buku Teks
Leininger, Madeleine M., author
John Wiley & Sons, 1978
Buku Teks