APA (7th ed.) Citation

Kirkwood, S., & Collis, P. (1991). The high latitude lower ionosphere observed by EISCAT. Advances in Space Research, 11(10), 109.

Chicago Style (17th ed.) Citation

Kirkwood, S., and P.N Collis. "The High Latitude Lower Ionosphere Observed by EISCAT." Advances in Space Research 11, no. 10 (1991): 109.

MLA (9th ed.) Citation

Kirkwood, S., and P.N Collis. "The High Latitude Lower Ionosphere Observed by EISCAT." Advances in Space Research, vol. 11, no. 10, 1991, p. 109.