Tkaczyk, F. (2015). Tracks & sign of reptiles & amphibians: A guide to North American species (First edition.). Stackpole Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTkaczyk, Filip. Tracks & Sign of Reptiles & Amphibians: A Guide to North American Species. First edition. Mechanicsburg, PA: Stackpole Books, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTkaczyk, Filip. Tracks & Sign of Reptiles & Amphibians: A Guide to North American Species. First edition. Stackpole Books, 2015.
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