Bretherick, L., author
Butterworth, 1990
Buku Referensi
Springer Cham, 2019
eBooks
Jakobsen, Hugo A., author
Cambridge University Press, 2014
Buku Teks
Melville, Arbaella, author
Willliam Collins & Sons, 1987
Buku Referensi
edited by Lyle F. Albright
CRC Press, 2009
Buku Referensi