(2019). Year Book & Infopedia 2020 (2019.). Hachette Book.
Chicago-čujuhus (17. p.)Year Book & Infopedia 2020. 2019. Hachette Book, 2019.
MLA-čujuhus (9. p.)Year Book & Infopedia 2020. 2019. Hachette Book, 2019.
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