Both Intrinsic and Extrinsic Religious Orientation are Positively Associated with Attitudes Toward Cleanliness: Exploring Multiple Routes from Godliness to Cleanliness.
Litman, L., Robinson, J., Weinberger-Litman, S., & Finkelstein, R. (2019). Both intrinsic and extrinsic religious orientation are positively associated with attitudes toward cleanliness: Exploring multiple routes from godliness to cleanliness. Journal of Religion and Health, 58(1), 41-52. doi:10.1007/s10943-017-0460-7
The original material can be found here: https://doi.org/10.1007/s10943-017-0460-7