APA (7 वां संस्करण) प्रशस्ति पत्र

Friedman, J. A., & Lowenstern, M. R. (1962). Labor law and practice in Costa Rica. United States Department of Labor, Bureau of Labor Statistics.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Friedman, Jesse A., और Martha R. Lowenstern. Labor Law and Practice in Costa Rica. [Washington, D.C.]: United States Department of Labor, Bureau of Labor Statistics, 1962.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Friedman, Jesse A., और Martha R. Lowenstern. Labor Law and Practice in Costa Rica. United States Department of Labor, Bureau of Labor Statistics, 1962.