APA (7th ed.) Citation

Chang, S. K. (1990). Principles of visual programming systems. Prentice Hall.

Chicago Style (17th ed.) Citation

Chang, S. K. Principles of Visual Programming Systems. Englewood Cliffs, N.J.: Prentice Hall, 1990.

MLA (9th ed.) Citation

Chang, S. K. Principles of Visual Programming Systems. Prentice Hall, 1990.