Beltran, B. P. (1986). Journey into solitude: A manual for retreats and recollections. Arnoldus Press.
Citace podle Chicago (17th ed.)Beltran, Benigno P. Journey into Solitude: A Manual for Retreats and Recollections. Metro Manila: Arnoldus Press, 1986.
Citace podle MLA (9th ed.)Beltran, Benigno P. Journey into Solitude: A Manual for Retreats and Recollections. Arnoldus Press, 1986.
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