Hi Ruth - I try and look for a source on a free site, such as FamilySearch first. If I don't find one there, I use the Ancestry info - it is still a source. I do try and put the info into the citation so others know what is there:
"Somerset, England, Church of England Baptisms, Marriages, and Burials, 1531-1812," database with images, ''Ancestry'' ([https://www.ancestry.com/interactive/60856/engl78030_d-p-kstone-2-1-1_m_00010/4581407 Somerset, England Baptisms] : accessed 16 November 2017), entry for Mary Minson, 7 Jan 1755; citing Anglican Parish Registers. Somerset Archives & Local Studies, South West Heritage Trust, Taunton, England. TEXT: Name: Mary Minson, Event: Baptism, Birth Date 7 Jan 1750, Place: Kingstone, Somerset, England