Alan B. Sterneckert (2003) Critical Incident Management. p. 126
Andrew Veronis (1978) Microprocessors: Design and Applications. p. 111
Mark A. Fryman (2001) Quality and Process Improvement. p. 169.
Harley R. Myler (1998). "2.3 Flowcharts". Fundamentals of Engineering Programming with C and Fortran. Cambridge University Press. pp. 32–36. ISBN978-0-521-62950-8.
Gilbreth, Frank Bunker; Gilbreth, Lillian Moller (1921). "Process Charts"(PDF). Archived from the original(PDF) on 2015-05-09. Retrieved 2016-05-06.. American Society of Mechanical Engineers.
Gilbreth, Frank Bunker; Gilbreth, Lillian Moller (1921). "Process Charts"(PDF). Archived from the original(PDF) on 2015-05-09. Retrieved 2016-05-06.. American Society of Mechanical Engineers.