Zelinsky, Wilbur, author
Prentice-Hall, 1966
Buku Teks
Gulati, P., author
Tata McGraw-Hill, 1984
Buku Teks
Hans Groth
Springer, 2012
eBooks
Saw, Swee-Hock, 1931-, author
Institute of South East Asia Studies, 2012
eBooks
Zelinsky, Wilbur
Prentice Hall International, 1970
Buku Teks