APA (7th ed.) Citation

Boerma, J. T., & et al. (1990). Immunization: Levels, trends, and differentials. Institute for Resource Development/Macro Systems, Inc.

Chicago Style (17th ed.) Citation

Boerma, J. Tiles, and et al. Immunization: Levels, Trends, and Differentials. Columbia, Md: Institute for Resource Development/Macro Systems, Inc, 1990.

MLA (9th ed.) Citation

Boerma, J. Tiles, and et al. Immunization: Levels, Trends, and Differentials. Institute for Resource Development/Macro Systems, Inc, 1990.