Boniface, Brian G
Routledge, 2016
Buku Teks
Eastwood, John
Oxford University Press, 1994
Buku Teks
Getis, Arthur
McGraw-Hill Higher Education, 2009
Buku Teks
Northam, Ray M.
John Wiley & Sons, 1979
Buku Teks
Unwin, Tim
Longman Scientific & Technical, 1992
Buku Teks