Gaya APA

Howarth, W. (1977). Manual Of Drilling Fluids Technology Source Of Mud Problems ; Vol I Sec I . : NL Boroid Peroleum Service.

Gaya MLA

Howarth, William. "Manual Of Drilling Fluids Technology Source Of Mud Problems ; Vol I Sec I". : NL Boroid Peroleum Service, 1977. Text.