(1981). Estimating Numbers Of Terrestrial Birds/editor: C. John Ralph. A Cooper ornithological.
Čikaški stil citiranja (17. izdanje)Estimating Numbers Of Terrestrial Birds/editor: C. John Ralph. A Cooper ornithological, 1981.
MLA način citiranja (8. izdanje)Estimating Numbers Of Terrestrial Birds/editor: C. John Ralph. A Cooper ornithological, 1981.
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