APA (7th ed.) Citation

Hennrich, P., Arnold, C., & Wensing, M. (2021). Effects of personalized invitation letters on research participation among general practitioners: A randomized trial. BMC medical research methodology, 21, . https://doi.org/10.1186/s12874-021-01447-y

Chicago Style (17th ed.) Citation

Hennrich, Patrick, Christine Arnold, and Michel Wensing. "Effects of Personalized Invitation Letters on Research Participation Among General Practitioners: A Randomized Trial." BMC Medical Research Methodology 21 (2021). https://doi.org/10.1186/s12874-021-01447-y.

MLA (9th ed.) Citation

Hennrich, Patrick, et al. "Effects of Personalized Invitation Letters on Research Participation Among General Practitioners: A Randomized Trial." BMC Medical Research Methodology, vol. 21, 2021, https://doi.org/10.1186/s12874-021-01447-y.