APA način citiranja (7. izdanje)

Havil, J. (2005). GAMMA: EXploring Euler`s Constant (1st.). ICFAI University Press.

Čikaški stil citiranja (17. izdanje)

Havil, Julian. GAMMA: EXploring Euler`s Constant. 1st. Hyderabad: ICFAI University Press, 2005.

MLA način citiranja (9. izdanje)

Havil, Julian. GAMMA: EXploring Euler`s Constant. 1st. ICFAI University Press, 2005.