Trelease, Sam Farlow, author
The Williams & Wilkins, 1958
Buku Teks
Day, Robert A., author
ISI Press, 1983
Buku Teks
Day, Robert A., author
ISI Press , 1979
Buku Teks
Day, Robert A., author
ISI Press, 1979
Buku Referensi
Gastel, Barbara, author
Greenwood, 2016
Buku Teks