APA-čujuhus (7. p.)
Gardner, D., & Overcott, N. (2006). Fifty common birds of the upper Midwest. University of Iowa Press.
Chicago-čujuhus (17. p.)
Gardner, Dana, juo Nancy Overcott. Fifty Common Birds of the Upper Midwest. Iowa City: University of Iowa Press, 2006.
MLA-čujuhus (9. p.)
Gardner, Dana, juo Nancy Overcott. Fifty Common Birds of the Upper Midwest. University of Iowa Press, 2006.
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