Dickey, Albert Venn, 1835-1922, author
Macmillan, 1915
Buku Teks
Oakland, John, author
Routledge , 1992
Buku Teks
Oakland, John, author
London; New York Routledge 1992,
Buku Teks
Theen, Rolf H.W, author
Prentice-Hall, 2001
Buku Teks
Davies, Paul L. , author
Sweet & Maxwell , 2012
Buku Teks