Gaya APA

Proceedings of the 12th International Congress of Speleology, La Chaux de Fonds, Switzerland 10-17 August 1997 / editor by Pierre Yves Jeannin. (1997). : .

Gaya MLA

Proceedings of the 12th International Congress of Speleology, La Chaux de Fonds, Switzerland 10-17 August 1997 / editor by Pierre Yves Jeannin. . : , 1997. Text.