Educational Services, Inc., Watertown, Mass. Elementary Science Study. (1965). Small things: An introduction to the microscopic world. Houghton Mifflin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEducational Services, Inc., Watertown, Mass. Elementary Science Study. Small Things: An Introduction to the Microscopic World. New York: Houghton Mifflin, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEducational Services, Inc., Watertown, Mass. Elementary Science Study. Small Things: An Introduction to the Microscopic World. Houghton Mifflin, 1965.
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