APA
American Petroleum Institute A., . (2015). Calculation of heather-tube thickness in petroleum refineries. Washington: American Petroleum Institute, API.
Chicago
American Petroleum Institute API, . 2015. Calculation of heather-tube thickness in petroleum refineries. Washington: American Petroleum Institute, API.
Harvard
American Petroleum Institute A., . (2015). Calculation of heather-tube thickness in petroleum refineries. Washington: American Petroleum Institute, API.
MLA
American Petroleum Institute API, . Calculation of heather-tube thickness in petroleum refineries. Washington: American Petroleum Institute, API. 2015.