Alan B. Sterneckert (2003) Critical Incident Management. p. 126 (页面存档备份,存于互联网档案馆)
Harley R. Myler. 2.3 Flowcharts. Fundamentals of Engineering Programming with C and Fortran. Cambridge University Press. 1998: 32–36 [2019-04-10]. ISBN 978-0-521-62950-8. (原始内容存档于2021-04-17).
Harley R. Myler. 2.3 Flowcharts. Fundamentals of Engineering Programming with C and Fortran. Cambridge University Press. 1998: 32–36 [2019-04-10]. ISBN 978-0-521-62950-8. (原始内容存档于2021-04-17).
Alan B. Sterneckert (2003) Critical Incident Management. p. 126 (页面存档备份,存于互联网档案馆)
Harley R. Myler. 2.3 Flowcharts. Fundamentals of Engineering Programming with C and Fortran. Cambridge University Press. 1998: 32–36 [2019-04-10]. ISBN 978-0-521-62950-8. (原始内容存档于2021-04-17).
ISO 5807:1985. International Organization for Standardization. February 1985 [23 July 2017]. (原始内容存档于2021-04-17).
Harley R. Myler. 2.3 Flowcharts. Fundamentals of Engineering Programming with C and Fortran. Cambridge University Press. 1998: 32–36 [2019-04-10]. ISBN 978-0-521-62950-8. (原始内容存档于2021-04-17).