Angel Popov and Zdravko Karakehayov, Data Acquisition Systems, Technica, Sofia, 1988 (in Bulgarian).
Zdravko Karakehayov and Stanislav Grigorov, Single Chip Microcomputers, Technica, Sofia, 1992, ISBN 954-03-0146-7 (in Bulgarian).
Zdravko Karakehayov and Emil Saramov, Applied Microcomputer Systems, Technical University of Sofia, 1995, ISBN 954-438-137-6 (in Bulgarian).
Zdravko Karakehayov, Knud Smed Christensen and Ole Winther, Embedded Systems Design with 8051 Microcontrollers, Marcel Dekker, 1999, ISBN: 0-8247-7696-8.
Здравко Каракехайов, Кнуд Кристенсен и Оле Винтер, Проектиране на вградени микрокомпютърни системи с микроконтролери, PENSOFT, 2000, ISBN: 954-642-101-4.
Zdravko Karakehayov, Sensor Networks, Technical University of Sofia, 2011 (in Bulgarian).