edited by Howard Giles and W. Peter Robinson
John Wiley & Sons, 1990
Buku Referensi
Lambert, Wallace E.
Stanford University press, 1972
Buku Teks SO
Devito, Joseph A.
Random House, 1970
Buku Teks SO
Caplan, David
MIT Press, 1993
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Church, Joseph
Random House, 1961
Buku Teks SO