I am going through the profiles on my watch list to improve the sources. I have been trying to replace the sources I added from Ancestry.com with free sources when I can. I have an ancestry record for Samuel Ringo's father Henry in the 1777 Prince William County Virginia Rental Roll which is just an index without an image (Jackson, Ron V., Accelerated Indexing Systems, comp.. Virginia Census, 1607-1890).
So with a bit of internet searching I found a transcribed copy of this document at https://www.yumpu.com/en/document/view/32743683/rent-roll-1777-eservices-of-prince-william-county-virginia
Here is the reference that I made based on a Chicago style. Is this a correct way to reference this source?
<ref>"A Rental for Prince William County for the year 1777." Rent Roll 1777 - eServices of Prince William County, Virginia. Accessed October 27, 2017. https://www.yumpu.com/en/document/view/32743683/rent-roll-1777-eservices-of-prince-william-county-virginia.
Transcribed by Greg Mason, RELIC Volunteer, March 2011 Bull Run Regional Library, Manassas, Virginia Source: "A Rental for Prince William County for the year 1777": Prince William County, Virginia manuscripts in the Huntington Library, 1 microfilm reel (366 frames); RELIC Microfilm 975.527 Pri. pg. 14 citing entry for Henry Ringo listing 130 acres</ref>
Thanks for your help.