Merwin, J. C. (1955). Mathematics teaching aids for a stronger America, prepared for the Illinois Curriculum Program, Aviation Education Project. s.n.
Cita Chicago (17th ed.)Merwin, Jack Clifford. Mathematics Teaching Aids for a Stronger America, Prepared for the Illinois Curriculum Program, Aviation Education Project. Springfield: s.n, 1955.
Cita MLA (9th ed.)Merwin, Jack Clifford. Mathematics Teaching Aids for a Stronger America, Prepared for the Illinois Curriculum Program, Aviation Education Project. s.n, 1955.
Atenció: Aquestes cites poden no estar 100% correctes.