Morris, Richard, author
Simon and Schuster, 1983
Buku Referensi
Stein, Sherman K., author
W.H. Freeman, 1969
Buku Teks
Wood, Harley
Angus and Robertson, 1967
Buku Teks
Parents' Magazine's Cultural Institute, 1965
Buku Referensi
Fuller, Graham E.
Westeriew Press, 1991
Buku Teks