Peterken, G. F. (1967). Guide to the checksheet for IBP areas.
Chicago Edition CitationPeterken, G F. Guide to the Checksheet for IBP Areas. International Biological Programme, London, 1967.
MLA Edition CitationPeterken, G F. Guide to the Checksheet for IBP Areas. 1967.
Warning: These citations may not always be 100% accurate.