APA

Helgeson H. C., Brown T. H. & Leeper R. H. (1969). Handbook of theoretical activity diagrms depicting chemical equilibria in geologic systems involving an aqueous phase at one Atm and 0 ̊to 300 ̊C. San Francisco: Freeman, Cooper.

Chicago

Helgeson Harold C, Brown Thomas H and Leeper Robert H. 1969. Handbook of theoretical activity diagrms depicting chemical equilibria in geologic systems involving an aqueous phase at one Atm and 0 ̊to 300 ̊C. San Francisco: Freeman, Cooper.

Harvard

Helgeson H. C., Brown T. H. and Leeper R. H. (1969). Handbook of theoretical activity diagrms depicting chemical equilibria in geologic systems involving an aqueous phase at one Atm and 0 ̊to 300 ̊C. San Francisco: Freeman, Cooper.

MLA

Helgeson Harold C, Brown Thomas H and Leeper Robert H. Handbook of theoretical activity diagrms depicting chemical equilibria in geologic systems involving an aqueous phase at one Atm and 0 ̊to 300 ̊C. San Francisco: Freeman, Cooper. 1969.