Fisher, Alec
Erlangga, 2008
Buku Teks
Randall, John Herman
Barnes & Noble, 1957
Buku Teks
Brightman, Edgar Sheffield
Holt, Rinehart and Winston, 1961
Buku Teks
Patrick, George Thomas White
George Allen and Unwin, 1925
Buku Teks
Christian, James L.
Wadsworth and Cengage Learning, 2012
Buku Teks