Tohutoro APA (7th ed.)
Pieper, J. (1972). El amor (1a. ed.). Rialp.
Tohutoru Kātū Chicago (17th ed.)
Pieper, Josef. El Amor. 1a. ed. Madrid: Rialp, 1972.
Tohutoro MLA (9th ed.)
Pieper, Josef. El Amor. 1a. ed. Rialp, 1972.
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