Heaton and Goodman's Church study that is the source of the popular 6% divorce statistic for temple marriages.
Tim Heaton and Kristen Goodman, "Religion and Family Formation," Review of Religious Research 26, no. 4 (1985): 354
Table 5: % of ever married persons who ever divorced. Males: 5.4 for temple marriage. Female: 6.5 for temple marriage.