APA (7th ed.) Citation

Thompson, R. A., Simpson, J. A., & Berlin, L. J. (2021). Attachment: The fundamental questions. The Guilford Press.

Chicago Style (17th ed.) Citation

Thompson, Ross A., Jeffry A. Simpson, and Lisa J. Berlin. Attachment: The Fundamental Questions. New York: The Guilford Press, 2021.

MLA (9th ed.) Citation

Thompson, Ross A., et al. Attachment: The Fundamental Questions. The Guilford Press, 2021.