Gaya APA

(API), A, P, I. (1986). Specification for Drill Through Equipment. API Specification 16A (Spec 16A) (1986). : Washington DC : American Petroleum Inst.,.

Gaya MLA

(API), American, Petrol., Inst.. "Specification for Drill Through Equipment. API Specification 16A (Spec 16A)". 1986 : Washington DC : American Petroleum Inst.,, 1986. Text.