Cita APA (7a ed.)

Estats Units. US Department of Health, E. (1971). A statement of principles. US DHEW. Office of Child Development.

Cita Chicago Style (17a ed.)

Estats Units. US Department of Health, Education. A Statement of Principles. Washington, D.C.: US DHEW. Office of Child Development, 1971.

Cita MLA (9a ed.)

Estats Units. US Department of Health, Education. A Statement of Principles. US DHEW. Office of Child Development, 1971.