Are the costs correct?

MLA

Guyatt, Helen. “Are the Costs Correct?” Trends in Parasitology, vol. 18, no. 3, Mar. 2002, pp. 104–05. EBSCOhost, https://doi.org/10.1016/s1471-4922(02)02259-6.

APA

Guyatt, H. (2002). Are the costs correct? Trends in Parasitology, 18(3), 104–105. https://doi.org/10.1016/s1471-4922(02)02259-6

Chicago

Guyatt, Helen. 2002. “Are the Costs Correct?” Trends in Parasitology 18 (3): 104–5. doi:10.1016/s1471-4922(02)02259-6.