Leblanc, Hugues
Mass. Allyn and Bacon , 1974
Buku Teks
Prior, Arthur N.
At The Clarendon Press, 1956
Buku Teks
Wallace, Walter L.
Aldine Publishing Company, 1971
Buku Teks
Marcovitz, Alan B.
McGraw-Hil, 2002
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Carnap, Rudolf, author
Dover Publications, 1958
Buku Teks