Engler, Richard E.
Harper & Row, 1964
Buku Teks
Engler, Richard E., author
Harper & Row, 1964
Buku Teks
I Nyoman Mardika, author
Bappeda of Denpasar City, 2013
Buku Teks
Mahathir bin Mohamad, 1925-, author
Pelanduk Publications, 1986
Buku Teks
Artikel Jurnal