De Marle, D. J. and M. L. Shillito (1992). "Function Analysis," in Shillito, M. L. and D. J. De Marle, ed., Value, Its Measurement, Design, and Management, John Wiley & Sons Inc, New York NY.
Lyman, D. (1992). "The Functional Relationship Between QFD and VE," Proceedings of the Society of American Value Engineers, Vol. 27, pp. 79-85.
Snodgrass, T. J. and M. K. Kasi (1986). Function Analysis: The Stepping Stones to Good Value, The University of Wisconsin, Madison WI.