Retinal has a highly dipolar vertically excited singlet state: implications for vision.

MLA

Mathies, R., and L. Stryer. “Retinal Has a Highly Dipolar Vertically Excited Singlet State: Implications for Vision.” Proceedings of the National Academy of Sciences of the United States of America, vol. 73, no. 7, July 1976, pp. 2169–73. EBSCOhost, https://doi.org/10.1073/pnas.73.7.2169.

APA

Mathies, R., & Stryer, L. (1976). Retinal has a highly dipolar vertically excited singlet state: implications for vision. Proceedings of the National Academy of Sciences of the United States of America, 73(7), 2169–2173. https://doi.org/10.1073/pnas.73.7.2169

Chicago

Mathies, R, and L Stryer. 1976. “Retinal Has a Highly Dipolar Vertically Excited Singlet State: Implications for Vision.” Proceedings of the National Academy of Sciences of the United States of America 73 (7): 2169–73. doi:10.1073/pnas.73.7.2169.