Churchill's , R. P. (1986). Study guide to accompany becoming logical an introduction to logic. St.Marin's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChurchill's , Robert Paul. Study Guide to Accompany Becoming Logical an Introduction to Logic. St.Marin's Press, 1986.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChurchill's , Robert Paul. Study Guide to Accompany Becoming Logical an Introduction to Logic. St.Marin's Press, 1986.
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