(ASA Style Guide 2014 section 5.3.1 p. 82, and appendix p. 115)
(Author1 Last name and Author2 Last name Year of publication)
(Font and Mendez 2013)
Author1 Last name, First name, and Author2 First name Last name. Year of publication. Title of Book (italicized). Retrieved Month date, year (URL).
Font, Joan, and Monica Mendez, eds. 2013. Surveying Ethnic Minorities and Immigrant Populations: Methodological Challenges and Research Strategies. Retrieved. June 26, 2017 (http://www.oapen.org/search?identifier=450851).
If the author has a middle name, it is included after their first name.