APA Style
Tjahjadi, I, N., obeng, D.
(1954).
Elementary Thery of Numbers
.
:
Mc. Graw Hill Paperbacks.
MLA Style
Tjahjadi, Ir., Nur., obeng, Djumri.
"Elementary Thery of Numbers".
:
Mc. Graw Hill Paperbacks,
1954.
Buku PGSD.