著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL "Verhofstad, Jan and Universiteit van Amsterdam","The geology of the Wilhelmina Mountains in Suriname, with special reference to the occurrence of Precambrian ash-flow tuffs",,Drukkerij Princo,1970,Geologisch Instituut mededeeling,,,,https://cir.nii.ac.jp/crid/1130282272233144704