Sargent, Lyman Tower, author
Erlangga, 1987
Buku Teks
Schaper, B. W.
Van Gorcum , 1963
Buku Teks
Spanier, John W.
Praeger , 1967
Buku Teks
Coleman, Janet, author
Blackwell Publishers, Ltd, 2000
Buku Teks
Losco, Joseph, author
Radja Grafindo Persada, 2005
Buku Teks