APA (7th ed.) Citation

(1970). Ecosystems: Student manual (Trial ed.). Science Curriculum Improvement Study.

Chicago Style (17th ed.) Citation

Ecosystems: Student Manual. Trial ed. Berkeley, CA: Science Curriculum Improvement Study, 1970.

MLA (9th ed.) Citation

Ecosystems: Student Manual. Trial ed. Science Curriculum Improvement Study, 1970.

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