β-Endorphin.

MLA

Hammonds, R.Glenn, and Choh Hao Li. “β-Endorphin.” International Journal of Peptide & Protein Research, vol. 19, no. 3, Mar. 1982, pp. 254–58. EBSCOhost, https://doi.org/10.1111/j.1399-3011.1982.tb03035.x.

APA

Hammonds, R. G., & Li, C. H. (1982). β-Endorphin. International Journal of Peptide & Protein Research, 19(3), 254–258. https://doi.org/10.1111/j.1399-3011.1982.tb03035.x

Chicago

Hammonds, R. Glenn, and Choh Hao Li. 1982. “β-Endorphin.” International Journal of Peptide & Protein Research 19 (3): 254–58. doi:10.1111/j.1399-3011.1982.tb03035.x.