APA (7th ed.) Citation

(1970). Ecosystems: Teacher's guide (Trial ed.). Science Curriculum Improvement Study.

Chicago Style (17th ed.) Citation

Ecosystems: Teacher's Guide. Trial ed. Berkeley, CA: Science Curriculum Improvement Study, 1970.

MLA (9th ed.) Citation

Ecosystems: Teacher's Guide. Trial ed. Science Curriculum Improvement Study, 1970.

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