Harmer, S., & Shipley, A. (1968). Cambridge natural history: Birds. Today And Tommorow.
シカゴスタイル引用形Harmer, S.F, , A.E Shipley. Cambridge Natural History: Birds. New Delhi: Today And Tommorow, 1968.
MLA引用形式Harmer, S.F, , A.E Shipley. Cambridge Natural History: Birds. Today And Tommorow, 1968.
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