Onslow, Muriel Wheldale
Cambridge University Press, 2014
Buku Teks
edited by Harry S. Katz, John V. Meleski
Van Nostrand Reinhold, 1996
Buku Referensi
Artikel Jurnal
Wan Azlina Ahmad
Springer, 2012
eBooks
Sienko, Michell J.
McGraw-Hill Kogakusha, 1961
Buku Teks