Garcia, Maria Jesus Lerma, author
Springer, 2012
eBooks
edited by Pieter Sanders
Kluwer, 1983
Buku Teks
Romeyn, Mary
Jossey-Bass , 1998
Buku Teks
by Amilcar O. Herrera ... [et al.]
International Development Research Centre, 1976
Buku Teks
The World Publishing Company, 1943
Buku Referensi