Essential writings
MLA
Rupp, Joyce, and Michael Leach. Essential Writings. Modern Spiritual Masters Series. Maryknoll, New York: Orbis Books, 2017
APA, 7th edition
Rupp, J., & Leach, M. (2017). Essential writings. Modern spiritual masters series. Maryknoll, New York: Orbis Books
Chicago, 17th edition
Rupp, Joyce, and Michael Leach. Essential writings. Modern spiritual masters series. Maryknoll, New York: Orbis Books, 2017