APA (7th ed.) Citation

(1968). Populations: A science unit for the primary grades (Trial ed.). Science Curriculum Improvement Study.

Chicago Style (17th ed.) Citation

Populations: A Science Unit for the Primary Grades. Trial ed. Berkeley, CA: Science Curriculum Improvement Study, 1968.

MLA (9th ed.) Citation

Populations: A Science Unit for the Primary Grades. Trial ed. Science Curriculum Improvement Study, 1968.

Warning: These citations may not always be 100% accurate.