Harahap, M. Yahya, author
Gramedia, 1988
Buku Teks
Harahap, M. Yahya, author
Gramedia, 1989
Buku Teks
Harahap, M. Yahya, author
Sinar Grafika, 2017
Buku Teks
Teuku Sofyan, author
1989
UI - Skripsi (Membership)
Ulysses Sjahdimar Endropoetro, author
Universitas Indonesia, 1987
UI - Skripsi (Membership)