Cita APA (7th ed.)

Lerch, H. H. (1981). Teaching elementary school mathematics: An active learning approach]. Houghton Mifflin.

Cita Chicago (17th ed.)

Lerch, Harold H. Teaching Elementary School Mathematics: An Active Learning Approach]. Boston: Houghton Mifflin, 1981.

Cita MLA (9th ed.)

Lerch, Harold H. Teaching Elementary School Mathematics: An Active Learning Approach]. Houghton Mifflin, 1981.