Manullang, M., author
Ghalia Indonesia, 1976
Buku Teks
Manullang, M., author
Gadjah Mada University Press, 2001
Buku Teks
Flippo, Edwin B., author
Erlangga, 1990
Buku Teks
Manullang, M., author
[publisher not identified], [year of publication not identified]
Buku Teks
Flippo, Edwin B., author
Erlangga, 1996
Buku Teks