Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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