"Receding Waves: Child Sexual Abuse and Homosexual Priests Since 2000." Chapter 12 in Adolphe, J.F. (ed.), Clerical Sexual Misconduct with Males: An Interdisciplinary Analysis. (Providence, RI: Cluny Media, 2020).

Affective and Substance Abuse Disorders Following Abortion by Pregnancy Intention in the United States: A Longitudinal Cohort Study. Medicina 2019, 55, 741.

Is sexual abuse by Catholic clergy related to homosexuality?”  National Catholic Bioethics Quarterly, vol. 18 no. 4 (Winter 2018): 671-697. 

Danish-like regulations may improve post-abortion mental health risk.” Refereed comment, with Donna Harrison, M.D. Journal of the American Medical Association (JAMA Psychiatry), October 2018.   

No Wedding’s a Wedding without a Cake’: The History and Significance of the Wedding Cake.”  The Natural Family, vol. 31 no. 2 (2017): 149-164. 

Sample Errors Call Into Question Conclusions Regarding Same-Sex Married Parents: A Comment on ‘Family Structure and Child Health: Does the Sex Composition of Parents Matter?’ Reczek et al.  Demography, October 2, 2017.

"Developmental Outcomes for Children with Same-sex Parents: What We Know, and What We Do Not Know." Pages 79-97 in Canzi, Elena, Same-Sex Parenting, Filiation, and Related Topics: A Critical Research Review.  Notebook 29, Center for Family Studies, Catholic University of the Sacred Heart.  (Milan, Italy: Vita e Pensiero, 2017).

"The Tragedy of Divorce for Children." Chapter 2, pp. 19-40 in McCarthy, Margaret (ed.), Torn Asunder: Children, the Myth of the Good Divorce, and the Recovery of Origins.  (Grand Rapids, MI: Eerdmans Publishing Co., 2017).

Supreme Court of the United States, Brief of Amici Curiae Mark Regnerus, Paul Sullins et al in Support of Petitioners, Masterpiece Cakeshop, Ltd., and Jack C. Phillips v. Colorado Civil Rights Commission (Joseph E. Holland, Counsel of Record), for Alliance Defending Freedom.

"The History of the 1980 Pastoral Provision." The Catholic Historical Review.  Summer 2017:95-124.

Keeping the Vow: the Untold Story of Married Catholic Priests. (Oxford University Press, 2015).

The Conjugal Family: An Irreplaceable Resource for Society. With Pierpaolo Donati, eds. (Libreria Editrice Vaticana, 2015).