Spranger, E. (1927). Psychologie des Jugendalters.
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Tohutoru Kātū Chicago (17th ed.)
Spranger, Eduard. Psychologie Des Jugendalters. Leipzig, 1927.
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Tohutoro MLA (9th ed.)
Spranger, Eduard. Psychologie Des Jugendalters. 1927.
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Kua rahua te tārua ki te papatopenga
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