Standards of prenatal care :
an outline for the use of physicians.

APA Citation

United States. Children's Bureau. (1940). Standards of prenatal care: an outline for the use of physicians. Revised ed. Washington: GPO.

MLA Citation

United States. Children's Bureau. Standards of Prenatal Care: an Outline for the Use of Physicians. Revised ed. Washington: GPO, 1940.

Warning: These citations may not always be complete (especially for serials).