Gaya APA

Darley.H.C.H,Gray.George.R, . (1948,1953,1963,1980,). Composition and Properties of Drilling and Completion Fluids 5th edition . Houston: Gulf Professional Publishing.

Gaya MLA

Darley.H.C.H,Gray.George.R, . "Composition and Properties of Drilling and Completion Fluids 5th edition". Houston: Gulf Professional Publishing, 1948,1953,1963,1980,. E-book.