APA (7th ed.) Citation

Petersen, J. L. (1977). The [Greek pi] [Greek pi] [i.e. Pi Pi] interaction. European Organization for Nuclear Research.

Chicago Style (17th ed.) Citation

Petersen, Jens L. The [Greek Pi] [Greek Pi] [i.e. Pi Pi] Interaction. Geneva: European Organization for Nuclear Research, 1977.

MLA (8th ed.) Citation

Petersen, Jens L. The [Greek Pi] [Greek Pi] [i.e. Pi Pi] Interaction. European Organization for Nuclear Research, 1977.