APA (7th ed.) Citation

Mace, D. R., & Mace, V. (2009). Marriage Enrichment Retreats Story of a Quaker Project. Project Gutenberg.

Chicago Style (17th ed.) Citation

Mace, D. R., and Vera Mace. Marriage Enrichment Retreats Story of a Quaker Project. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Mace, D. R., and Vera Mace. Marriage Enrichment Retreats Story of a Quaker Project. Project Gutenberg, 2009.

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