Dubinsky, Ed; Harel, Guershon (1992). The Concept of Function: Aspects of Epistemology and Pedagogy. Mathematical Association of America. ISBN978-0-88385-081-7.
Husch, Lawrence S. (2001). Visual Calculus. University of Tennessee. Ilihifadhiwa kwenye nyaraka kutoka chanzo mnamo 2011-09-24. Iliwekwa mnamo 2007-09-27. {{cite book}}: Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
Malik, M. A. (1980). "Historical and pedagogical aspects of the definition of function". International Journal of Mathematical Education in Science and Technology. 11 (4): 489–492. doi:10.1080/0020739800110404.
Reichenbach, Hans (1947) Elements of Symbolic Logic, Dover Publishing Inc., New York, Kigezo:Isbn.
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