Hydrick, B., & Murphy, G. (1987). A guide to the microfilm edition of Confidential U.S. State Department Central Files: Decimal numbers 693, 693B, 611.93, 611.93B, and 611.93C. University Publications of America.

Hydrick, Blair, and Gregory Murphy. A Guide to the Microfilm Edition of Confidential U.S. State Department Central Files: Decimal Numbers 693, 693B, 611.93, 611.93B, and 611.93C. Frederick, MD: University Publications of America, 1987.

Hydrick, Blair, and Gregory Murphy. A Guide to the Microfilm Edition of Confidential U.S. State Department Central Files: Decimal Numbers 693, 693B, 611.93, 611.93B, and 611.93C. University Publications of America, 1987.