APA-Zitierstil (7. Ausg.)

(1921). National safety code for the protection of the heads and eyes of industrial workers (1. ed. Dec., 1920.). Gov. Print. Off.

Chicago-Zitierstil (17. Ausg.)

National Safety Code for the Protection of the Heads and Eyes of Industrial Workers. 1. ed. Dec., 1920. Washington: Gov. Print. Off, 1921.

MLA-Zitierstil (9. Ausg.)

National Safety Code for the Protection of the Heads and Eyes of Industrial Workers. 1. ed. Dec., 1920. Gov. Print. Off, 1921.