National Geographic Book Service
National Geographic Society, 1988
Buku Referensi
Ewing, Ethel E., author
Rand McNally & Company, 1962
Buku Teks
Easley, David, author
Cambridge University Press, 2018
Buku Teks
Amaresh Chakrabarti, editor
Springer Nature, 2019
eBooks
Amaresh Chakrabarti, editor
Springer Nature, 2019
eBooks