Citazione Stile APA (7a Edizione)

(1969). Populations: Teacher's guide (Preliminary ed.). Science Curriculum Improvement Study.

Citazione stile Chigago Style (17a edizione)

Populations: Teacher's Guide. Preliminary ed. Berkeley, CA: Science Curriculum Improvement Study, 1969.

Citatione MLA (9a ed.)

Populations: Teacher's Guide. Preliminary ed. Science Curriculum Improvement Study, 1969.