Tolerance develops to sympathetic effects of khat in humans.

MLA

Nencini, P., et al. “Tolerance Develops to Sympathetic Effects of Khat in Humans.” Pharmacology, vol. 28, no. 3, 1984, pp. 150–54. EBSCOhost, https://doi.org/10.1159/000137956.

APA

Nencini, P., Ahmed, A. M., Amiconi, G., & Elmi, A. S. (1984). Tolerance develops to sympathetic effects of khat in humans. Pharmacology, 28(3), 150–154. https://doi.org/10.1159/000137956

Chicago

Nencini, P, A M Ahmed, G Amiconi, and A S Elmi. 1984. “Tolerance Develops to Sympathetic Effects of Khat in Humans.” Pharmacology 28 (3): 150–54. doi:10.1159/000137956.