edited by Carie Sussman, Barbara M. Bates-Jensen
AN Aspen , 1998
Buku Teks
editor, Hannu Larjava
John Wiley & Sons, 2012
Buku Teks
UNDP and ESCAP , 1987
Buku Teks
edited by Richard Harrison ; editorial board, Neil Cossons ... [et al.].
Butterworth-Heinemann, 1994
Buku Teks
Muhlbauer, W. Kent.
Gulf Publishing Company, 1992
Buku Referensi