edited by Jacob A. Frenkel and Michael L. Mussa
Auburn House, 1984
Buku Teks
Fik, Timothy J.
McGraw-Hill , 2000
Buku Teks
Todaro, Michael P., author
Longmann, 1978
Buku Teks
edited by Zacharoula Andreopoulou, Vagis Samathrakis, Soulla Louca, Maro Vlacopoulu
Igi Global, 2014
Buku Teks
United Nations Centre for Human Settlements (Habitat), 1991
Buku Referensi