Spyker, J. (1848). A collection of geographical, moral, religious, Biblical, political and other chapters: In the form questions and answers ... Brady and Wilson.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpyker, Joel. A Collection of Geographical, Moral, Religious, Biblical, Political and Other Chapters: In the Form Questions and Answers ... Brookville, PA.: Brady and Wilson, 1848.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpyker, Joel. A Collection of Geographical, Moral, Religious, Biblical, Political and Other Chapters: In the Form Questions and Answers ... Brady and Wilson, 1848.
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