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.