Calle, C. I. (2001). Superstrings and other things: A guide to physics. Institute of physics.
Chicago-viite (17. p.)Calle, Carlos I. Superstrings and Other Things: A Guide to Physics. London: Institute of physics, 2001.
MLA-viite (9. p.)Calle, Carlos I. Superstrings and Other Things: A Guide to Physics. Institute of physics, 2001.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.