APA-čujuhus (7. p.)
Hoagland, E. (1978). African Calliope: A journey to the Sudan. Penguin Books.
Chicago-čujuhus (17. p.)
Hoagland, Edward. African Calliope: A Journey to the Sudan. England: Penguin Books, 1978.
MLA-čujuhus (9. p.)
Hoagland, Edward. African Calliope: A Journey to the Sudan. Penguin Books, 1978.
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