Ryken, L. (1987). Work and Leisure: In Christian perspective. Inter-Varsity.
Chicago-čujuhus (17. p.)Ryken, Leland. Work and Leisure: In Christian Perspective. England: Inter-Varsity, 1987.
MLA-čujuhus (9. p.)Ryken, Leland. Work and Leisure: In Christian Perspective. Inter-Varsity, 1987.
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