Gaya APA

(API), A, P, I. (1992). Specification for quality programs. API Specification Q1 (Spec Q1) (1992). : Washington DC : American Petroleum Inst.,.

Gaya MLA

(API), American, Petrol., Inst.. "Specification for quality programs. API Specification Q1 (Spec Q1)". 1992 : Washington DC : American Petroleum Inst.,, 1992. Text.