Merwin, J. C. (1955). Mathematics teaching aids for a stronger America, prepared for the Illinois Curriculum Program, Aviation Education Project. s.n.
Lua i Stíl Chicago (17ú heag.)Merwin, Jack Clifford. Mathematics Teaching Aids for a Stronger America, Prepared for the Illinois Curriculum Program, Aviation Education Project. Springfield: s.n, 1955.
Lua MLA (9ú heag.)Merwin, Jack Clifford. Mathematics Teaching Aids for a Stronger America, Prepared for the Illinois Curriculum Program, Aviation Education Project. s.n, 1955.
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