International Speleological Congress, Atkinson, T. C., & Smart, P. L. (1977). Caves and karst of southern England and South Wales: Guidebook for the International Congress of Speleology at Sheffield, 1977. 7th I.S.C. Committee ; [Distributed by] British Cave Research Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Speleological Congress, T. C. Atkinson, και P. L. Smart. Caves and Karst of Southern England and South Wales: Guidebook for the International Congress of Speleology at Sheffield, 1977. [Great Britain] : Bridgwater (BCRA Sales, 30 Main Rd, Westonzoyland, Bridgwater, Somerset): 7th I.S.C. Committee ; [Distributed by] British Cave Research Association, 1977.
Παραπομπή σε μορφή MLA (8th εκδ.)International Speleological Congress, et al. Caves and Karst of Southern England and South Wales: Guidebook for the International Congress of Speleology at Sheffield, 1977. 7th I.S.C. Committee ; [Distributed by] British Cave Research Association, 1977.