APA aipamena

Gray, J. E. (2003). Geologic Studies of mercury by the U.S. Geological Survey. US Geological Survey circular 1248.

Chicago Style aipamena

Gray, John E. "Geologic Studies of Mercury By the U.S. Geological Survey." US Geological Survey Circular 1248 2003.

MLA aipamena

Gray, John E. "Geologic Studies of Mercury By the U.S. Geological Survey." US Geological Survey Circular 1248 2003.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.