Educational Services, Inc., Watertown, Mass. Elementary Science Study. (1965). Small things: An introduction to the microscopic world. Houghton Mifflin.
Chicago-referens (17:e uppl.)Educational Services, Inc., Watertown, Mass. Elementary Science Study. Small Things: An Introduction to the Microscopic World. New York: Houghton Mifflin, 1965.
MLA-referens (9:e uppl.)Educational Services, Inc., Watertown, Mass. Elementary Science Study. Small Things: An Introduction to the Microscopic World. Houghton Mifflin, 1965.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.