In the Catholic Church the month of May is dedicated to Mary. In honor of that celebration I offer some recommended titles for my readers: Catholic, Protestant and Orthodox. Unfortunately, some of these are out of print but I listed them anyway because they are, well, just really good.
By Protestant Authors:
Blessed One: Protestant Perspectives on Mary, by Beverley Roberts Gaventa & Cynthia L. Rigby, eds. (Westminster John Knox, 2002)
Mary Through the Centuries: Her Place in the History of Culture by Jaroslav Pelikan (Yale University Press, 1996). (Note: At the time of the writing Pelikan was Lutheran. Two years later he was received into full communion in the Orthodox Church.)
Mary For Evangelicals: Toward an Understanding of the Mother of Our Lord by Tim Perry (IVP Academic, 2006, out of print)
The Real Mary: Why Evangelicals Can Embrace the Mother of Jesus by Scot McKnight (Paraclete Press, 2007)
Mary for All Christians by John Macquarrie (Eerdmans, 1990, out of print)
Christian History magazine devoted an issue to the topic of Mary. You can find that here. https://www.christianhistoryinstitute.org/magazine/issue/mary-in-the-imagination-of-the-church/
By Catholic authors (The amount of material on Mary from Catholics is enormous so I’m highlighting only a few that I’ve read myself in the past couple of years.) The last two books are not on Mary specifically but include a good chapter on her.
Behold Your Mother: A Biblical and Historical Defense of the Marian Doctrines by Tim Staples (Catholic Answers Press, 2014)
The Marian Mystery: Outline of Mariology by Denis Farkasfalvy, O. Cist. (St. Pauls, 2014)
Mary’s Bodily Assumption by Matthew Levering (University of Notre Dame Press, 2015)
What Does it Mean to be Catholic? By Jack Mulder, Jr. (Eerdmans, 2015)
Catholicism: A Journey to the Heart of the Faith by Robert Barron (Image Books, 2011)
By both Catholic and Protestant:
Mary: A Catholic—Evangelical Debate by Dwight Longenecker and David Gustafson (Brazos Press, 2003, out of print).
For an Orthodox perspective and some recommended readings see “Mary the Theotokos and the Call to Holiness” by Kyriaki Karidoyanes Fitzgerald in Mary, Mother of God edited by Carl E. Braaten and Robert W. Jenson (Eerdmans, 2004)
The Virgin Mary by Alexander Schmemann (Celebration of Faith series vol. 3, St. Vladamir’s Seminary Press, 1995)