APA-čujuhus (7. p.)
ebrary, Inc, & Vries, M. d. (2010). Protecting marine mammals. Nova Science.
Chicago-čujuhus (17. p.)
ebrary, Inc, juo Marielle de Vries. Protecting Marine Mammals. New York: Nova Science, 2010.
MLA-čujuhus (9. p.)
ebrary, Inc, juo Marielle de Vries. Protecting Marine Mammals. Nova Science, 2010.
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