APA (7th ed.) Citation

Kelly-Bootle, S. (2005). The Missing Ingredient. Software Development, 13(11), 21.

Chicago Style (17th ed.) Citation

Kelly-Bootle, Stan. "The Missing Ingredient." Software Development 13, no. 11 (2005): 21.

MLA (9th ed.) Citation

Kelly-Bootle, Stan. "The Missing Ingredient." Software Development, vol. 13, no. 11, 2005, p. 21.