APA (7th ed.) Citation

Hebecker, A., & Wetterich, C. (2001). Natural quintessence? Physics letters, 497(3/4), . https://doi.org/10.1016/S0370-2693(00)01339-3

Chicago Style (17th ed.) Citation

Hebecker, Arthur, and Christof Wetterich. "Natural Quintessence?" Physics Letters 497, no. 3/4 (2001). https://doi.org/10.1016/S0370-2693(00)01339-3.

MLA (9th ed.) Citation

Hebecker, Arthur, and Christof Wetterich. "Natural Quintessence?" Physics Letters, vol. 497, no. 3/4, 2001, https://doi.org/10.1016/S0370-2693(00)01339-3.