Williams, James, author
Routledge, 2000
Buku Teks
Maxey, Chester C., author
Macmillan, 1961
Buku Teks
edited by Heinz Eulau and James G. March
Prentice-Hall, 1969
Buku Teks
N. (Noeniek) Soemartojo
Erlangga, 1988
Buku Teks
Asad, Muhammad, 1900-, author
PT Mizan Pustaka, 2017
Buku Referensi