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Keifert, P. R. Olsen, Steen, Jacob’s Ladder: Missional Church in the 1970s: St. Marys, Australia: SA & RL Olsen, 2020. ISBN-13: 978-06-4899-680-4. EF 2022, 3 (1), 125-127. https://doi.org/10.54195/ef12159.