Baskett, Peter J.F
J.B. Lippincott , 1989
Buku Teks
Marius, Richard, author
McGraw-Hill, 1988
Buku Teks
Ironside, Virginia, author
Sheldon Press, 1995
Buku Referensi
Corwin, Elizabeth J., author
Lippincott, 1996
Buku Referensi
Loftness, Robert L., author
Van Nostrand Reinhold, 1984
Buku Referensi