Wetherell, D.F., author
IKIP Press, 1976
Buku Teks
Daisy P. Sriyanti Hendaryono, author
Kanisius , 1994
Buku Teks
Wetherell, D.F., author
IKIP Semarang Press, [date of publication not identified]
Buku Referensi
Universitas Indonesia, 2001
UI - Skripsi (Membership)
Artikel Jurnal