Dorcas, M. E., & Gibbons, W. (2011). Frogs: The animal answer guide. Johns Hopkins University Press.
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Chicago-čujuhus (17. p.)
Dorcas, Michael E., juo Whit Gibbons. Frogs: The Animal Answer Guide. Baltimore: Johns Hopkins University Press, 2011.
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MLA-čujuhus (9. p.)
Dorcas, Michael E., juo Whit Gibbons. Frogs: The Animal Answer Guide. Johns Hopkins University Press, 2011.
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