Gaya APA

HALL, W., KEYNES, M. (1985). Unit 4 geochemical reactions unit 5 geochemical cycles unit 6 applications of geochemistry . S.I.: The Open University Press.

Gaya MLA

HALL, Walton., KEYNES, Milton. "Unit 4 geochemical reactions unit 5 geochemical cycles unit 6 applications of geochemistry". S.I.: The Open University Press, 1985. Umum.