Citazione Stile APA (7a Edizione)

National Fire Protection Association. (2020). NFPA 2: Hydrogen technologies code 2020 (2020 edition.). National Fire Protection Association.

Citazione stile Chigago Style (17a edizione)

National Fire Protection Association. NFPA 2: Hydrogen Technologies Code 2020. 2020 edition. Quincy, Mass., United States: National Fire Protection Association, 2020.

Citatione MLA (9a ed.)

National Fire Protection Association. NFPA 2: Hydrogen Technologies Code 2020. 2020 edition. National Fire Protection Association, 2020.