edited by Jean M. fredette
Writers Digest Book, 1990
Buku Referensi
Writer's Digest Bokks, 1994
Buku Teks
Maimon, Elaine P.
McGraw-Hill, 2002
Buku Teks
Maimon, Elaine P.
McGraw-Hill , 2003
Buku Referensi
edited by Thomas Clark ... [and others]
Writers digest Books, 1994
Buku Referensi