Werbach, Melvyn R., author
Thorsons, 1993
Buku Referensi
Furth, Gregg M., author
University of Toronto, 2002
Buku Teks
Gibson, William, author
Bantam Books, 1962
Buku Teks
Norton, Donna E., author
Merril; A Bell and Howell Information, 1987
Koleksi Publik
Norton, Donna E., author
Merril; A Bell and Howell Information, 1987
Buku Teks