APA
Alföldi A., Papp B., . (1976). The problems of environmental protection for subsurface waters in hungary. Research Institute for Water Resources Development, Budapest: .
Chicago
Alföldi A, Papp B, . 1976. The problems of environmental protection for subsurface waters in hungary. Research Institute for Water Resources Development, Budapest: .
Harvard
Alföldi A., Papp B., . (1976). The problems of environmental protection for subsurface waters in hungary. Research Institute for Water Resources Development, Budapest: .
MLA
Alföldi A, Papp B, . The problems of environmental protection for subsurface waters in hungary. Research Institute for Water Resources Development, Budapest: . 1976.