Ikeda, D., & Inoue, Y. (1980). Letters of four seasons. Kodansha.
Chicago-čujuhus (17. p.)Ikeda, Daisaku, juo Yasushi Inoue. Letters of Four Seasons. Tokio: Kodansha, 1980.
MLA-čujuhus (9. p.)Ikeda, Daisaku, juo Yasushi Inoue. Letters of Four Seasons. Kodansha, 1980.
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