Semen Gresik, 1980
Buku Teks
[publisher not identified], [date of publication not identified]
Naskah
[publisher not identified], [date of publication not identified]
Naskah
Carey, Peter, author
Pustaka Azet, 1986
Buku Teks
Agus Eko Cahyono, author
Universitas Indonesia, 1993
UI - Skripsi (Membership)