APA
Petroleum Extension Service, International Association of Drilling Contractors I. & International Association of drilling contractors I. (1978). Guide to safe stairways, walkways, and railings. Austin, Texas: Petroleum Extension Service.
Chicago
Petroleum Extension Service, International Association of Drilling Contractors IADC and International Association of drilling contractors IADC. 1978. Guide to safe stairways, walkways, and railings. Austin, Texas: Petroleum Extension Service.
Harvard
Petroleum Extension Service, International Association of Drilling Contractors I. and International Association of drilling contractors I. (1978). Guide to safe stairways, walkways, and railings. Austin, Texas: Petroleum Extension Service.
MLA
Petroleum Extension Service, International Association of Drilling Contractors IADC and International Association of drilling contractors IADC. Guide to safe stairways, walkways, and railings. Austin, Texas: Petroleum Extension Service. 1978.