by Nancy I. Whitman [and others]
Appleton Century, 1986
Buku Teks
Billings, Diane M., author
[publisher not identified], [year of publication not identified]
Buku Teks
Tornyay, Rheba de, author
John Wiley & Sons, 1982
Buku Teks
Reilly, Dorothy E., author
Jones and Bartlett , 1999
Buku Teks
edited by Susan M. Hincliff
Churchill livingstone , 1979
Buku Teks