Barker, S. F. (1974). The Elements of Logic (2nd ed.). McGraw-Hill.
Tohutoru Kātū Chicago (17th ed.)Barker, Stephen F. The Elements of Logic. 2nd ed. New York: McGraw-Hill, 1974.
Tohutoro MLA (9th ed.)Barker, Stephen F. The Elements of Logic. 2nd ed. McGraw-Hill, 1974.
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