(1969). Populations: Teacher's guide (Preliminary ed.). Science Curriculum Improvement Study.
Čikaški stil citiranja (17. izdanje)Populations: Teacher's Guide. Preliminary ed. Berkeley, CA: Science Curriculum Improvement Study, 1969.
MLA način citiranja (9. izdanje)Populations: Teacher's Guide. Preliminary ed. Science Curriculum Improvement Study, 1969.
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