APA (7th ed.) Citation

N, S., & BA, S. (2003). Contralateral headache. British journal of neurosurgery, 17(1), 89.

Chicago Style (17th ed.) Citation

N, Sudhakar, and Simpson BA. "Contralateral Headache." British Journal of Neurosurgery 17, no. 1 (2003): 89.

MLA (9th ed.) Citation

N, Sudhakar, and Simpson BA. "Contralateral Headache." British Journal of Neurosurgery, vol. 17, no. 1, 2003, p. 89.