Harahap, Indarti Primora Barlianta, author
1994
UI - Tesis (Membership)
Malvino, Albert Paul, author
Erlangga, 1994
Buku Teks
Wasito S., author
Karya Utama, 1981
Buku Teks
editor in chief, Charles A. Ford
Encyclopedia Britannica Educational Corporation, 1969
Buku Referensi
Lucie Parker, editor; Laura Harger, editor
The Exploratorium and Weldon Owen Inc., 2013
Buku Referensi