The Helsinki Declaration 2020: Europe that protects.

MLA

Halonen, Jaana I., et al. “The Helsinki Declaration 2020: Europe That Protects.” The Lancet. Planetary Health, vol. 4, no. 11, Nov. 2020, pp. e503–05. EBSCOhost, https://doi.org/10.1016/S2542-5196(20)30242-4.

APA

Halonen, J. I., Erhola, M., Furman, E., Haahtela, T., Jousilahti, P., Barouki, R., Bergman, Å., Billo, N. E., Fuller, R., Haines, A., Kogevinas, M., Kolossa-Gehring, M., Krauze, K., Lanki, T., Vicente, J. L., Messerli, P., Nieuwenhuijsen, M., Paloniemi, R., Peters, A., … Antó, J. M. (2020). The Helsinki Declaration 2020: Europe that protects. The Lancet. Planetary Health, 4(11), e503–e505. https://doi.org/10.1016/S2542-5196(20)30242-4

Chicago

Halonen, Jaana I, Marina Erhola, Eeva Furman, Tari Haahtela, Pekka Jousilahti, Robert Barouki, Åke Bergman, et al. 2020. “The Helsinki Declaration 2020: Europe That Protects.” The Lancet. Planetary Health 4 (11): e503–5. doi:10.1016/S2542-5196(20)30242-4.