APA

USA, . (19). National Bureau of Standards report. Washington, DC: US Gov. Print Off.

Chicago

USA, . 19. National Bureau of Standards report. Washington, DC: US Gov. Print Off.

Harvard

USA, . (19). National Bureau of Standards report. Washington, DC: US Gov. Print Off.

MLA

USA, . National Bureau of Standards report. Washington, DC: US Gov. Print Off. 19.