APA
American Petroleum Institute A., . (2008). Specification for indirect type oilfield heaters. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2008. Specification for indirect type oilfield heaters. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2008). Specification for indirect type oilfield heaters. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Specification for indirect type oilfield heaters. Washington: American Petroleum Institute, API. 2008.