Educational Services, Inc., Watertown, Mass. Elementary Science Study. (1965). Small things: An introduction to the microscopic world. Houghton Mifflin.
Chicago-viite (17. p.)Educational Services, Inc., Watertown, Mass. Elementary Science Study. Small Things: An Introduction to the Microscopic World. New York: Houghton Mifflin, 1965.
MLA-viite (9. p.)Educational Services, Inc., Watertown, Mass. Elementary Science Study. Small Things: An Introduction to the Microscopic World. Houghton Mifflin, 1965.
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