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The analytical section at the end of Gibson (1975) was originally published as "Magnification and Depth of Detail in Photomacrography" in the Journal of the Photographic Society of America, Vol. 26, No. 6, June 1960. Gibson, H. Lou (1975). Close-Up Photography and Photomacrography. Kodak Publication No. N-16. Vol. II: Photomacrography (2nd combined ed.). Rochester, NY: Eastman Kodak Company, Professional and Finishing Markets Division. ISBN0-87985-160-0. OCLC1991448.
Merklinger 1992. Merklinger, Harold M. (1992). The INs and OUTs of FOCUS: An Alternative Way to Estimate Depth-of-Field and Sharpness in the Photographic Image (v. 1.0.3 ed.). Bedford, Nova Scotia: Seaboard Printing Limited. ISBN0-9695025-0-8. OCLC23651332. Version 1.03e available in PDF at http://www.trenholm.org/hmmerk/ .