Willoughby, S. S. (1981). Measuring bowser: Thinking story book. Open Court Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilloughby, Stephen S. Measuring Bowser: Thinking Story Book. Illinois: Open Court Publishers, 1981.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilloughby, Stephen S. Measuring Bowser: Thinking Story Book. Open Court Publishers, 1981.
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