Cita APA

Estados Unidos. Public Health Service, & Estados Unidos. Public Health Service. (1972). Opticians employed in health services: United States 1969. Rockville, Md.

Citación estilo Chicago

Estados Unidos. Public Health Service, y Estados Unidos. Public Health Service. Opticians Employed in Health Services: United States 1969. Rockville, Md, 1972.

Cita MLA

Estados Unidos. Public Health Service, y Estados Unidos. Public Health Service. Opticians Employed in Health Services: United States 1969. Rockville, Md, 1972.