APA Style

Rybach, L., Muffler, L. (1981). Geothermal Systems: Principles and Case Histories . Chichester: John Wiley & Sons.

MLA Style

Rybach, L.., Muffler, L.J.P.. "Geothermal Systems: Principles and Case Histories". Chichester: John Wiley & Sons, 1981. Text.