Hunt, Roberta, author
J.B. Lippincott, 1997
Buku Teks
Hunt, Roberta, author
Lippincott Wiliams & Wilkins, 2005
Buku Teks
Dunteman, George Henry
Sage Publications, 1984
Buku Teks
Masannat, George
Charles Scribner's Sons, 1970
Buku Teks
Holt, Rinehart and Winston, 1961
Buku Referensi