Merklinger, Harold M. (1992), Depth of Field Revisited. Dartmouth, Nova Scotia. A short version of a series of papers which first appeared in Shutterbug in 1991-1992. The author wonders why he rarely gets satisfactory sharpness using the hyperfocal distance, and shows why another focusing strategy gives better results.
Nasse, Hubert H. (2011), Planar—The history and features of one of photography’s most important high performance lenses. Carl Zeiss, Oberkochen, page 5.
Wegner, Gunther (2017), Diana lernt fotografieren. gwegner.de Verlag, Ahrensburg. The basics of photography from a very practical point of view. Especially chapter 4 on image composition is highly recommended for beginners and experienced photographers alike.
Zeiss (1997a), Depth of field—An insider’s look behind the scenes. Camera Lens News No. 1, Carl Zeiss, Oberkochen, page 3.
Zeiss (1997b), Resolution of camera lenses: Where are the limits—and why? Camera Lens News No. 2, Carl Zeiss, Oberkochen, pages 2-3. Limitations of resolution due to diffraction, depth of field, film, and motion.