More information at:
- Atkins, P. (1978). Physical chemistry. San Francisco: W.H. Freeman.
- Chemwiki.ucdavis.edu,. (2013). Activity - Chemwiki. Retrieved 27 October 2015, from http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Nonideal_Solutions/Activity
- Lue, L. (2009). Chemical thermodynamics. [s.l]: Ventus Publishing.