The Church Missionary Gleaner includes lots of information about Church Missionary Society (Anglican) missionaries in the late 1800s, many of whom were women. Issues are available on the Internet Archive for 1878-1892.
The Church Missionary Gleaner is also available on Wikimedia Commons for people to use as a reference and to take pictures from to use in Wikipedia articles. It is important to search on Wikimedia Commons under "Other Media"
Other historical books and journals can also be discovered in Wikimedia Commons that may provide useful references for missionaries from other denominations. Remember to search under "Other Media".