APA (7th ed.) Citation

Philadelphia Earth Week Committee & Zeh, J. (1970). Earth week '70. Philadelphia Earth Week Committee.

Chicago Style (17th ed.) Citation

Philadelphia Earth Week Committee and John Zeh. Earth Week '70. [Philadelphia]: Philadelphia Earth Week Committee, 1970.

MLA (9th ed.) Citation

Philadelphia Earth Week Committee and John Zeh. Earth Week '70. Philadelphia Earth Week Committee, 1970.

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