Chandra, Lokesh
Eternal Ganges, 2009
Buku Teks
Tuan, Yi-fu
Columbia University, 1990
Buku Teks
Hellman, Matilda
Oxford University Press, 2016
eBooks
Rokeach, Milton
Jossey-Bass Publishers, 1972
Buku Teks SO
Villanueva, Buenaventure M.
University of the Philippina, 1959
Buku Teks SO