Pollack, Peter
Harry N. Abrams, [1958]
Buku Referensi
Dummer, Geoffrey William Arnold
Pergamon Press, 1983
Buku Teks SO
by Wolfgang Beutin ... [and others]
Routledge, 1993
Buku Teks SO
Altamira, Rafael
Van Nostrand Reinhold, 1949
Buku Teks SO
Herring, Hubert
Alfred A. Knopf, 1968
Buku Teks SO