APA (7th ed.) Citation

Heristchi, D., Legrand, J. P., & Petrou, D. (1971). Balloon observations of solar protons on September 29?30, 1968, over Iceland. Solar Physics, 18(2), 321.

Chicago Style (17th ed.) Citation

Heristchi, Dj, J. P. Legrand, and D. Petrou. "Balloon Observations of Solar Protons on September 29?30, 1968, over Iceland." Solar Physics 18, no. 2 (1971): 321.

MLA (9th ed.) Citation

Heristchi, Dj, et al. "Balloon Observations of Solar Protons on September 29?30, 1968, over Iceland." Solar Physics, vol. 18, no. 2, 1971, p. 321.