Owing to the fact that a Living Reviews in Solar Physics article may evolve over time, we recommend to cite the article as follows:
Marius S. Potgieter,
"Solar Modulation of Cosmic Rays",
Living Rev. Solar Phys. 10, (2013), 3. URL (accessed <date>):
The date given as <date> then uniquely identifies the version of the article you are referring to.