I usually cite the index record on the profiles. There is a modified version thst I have used that has all the information, but it takes more time to cite them. If it is not my family line as in my hidden unknowns identifications then I usually just cite the index at family search because the image is usually available from the census record listings there.
The following references are pertaining to this individual who is a work in progress: https://www.wikitree.com/wiki/Robinson-22656
For example 1860:
- the index citation at FamilySearch: "United States Census, 1860", database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:MCP7-MVY : 13 December 2017), Benj Robinson, 1860.
- the actual image citation: "United States Census, 1860," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:33SQ-GBSX-9G7T?cc=1473181&wc=7QCB-VRH%3A1589432777%2C1589422318%2C1589434293 : 24 March 2017), Ohio > Washington > Barlow Township > image 21 of 30; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.).
- Modified Evidence Explained model: 1860 U.S. census, Washington County, Ohio, population schedule, Barlow Township, [https://www.familysearch.org/ark:/61903/3:1:33SQ-GBSX-9G7T?i=20&cc=1473181 p. 273 A (stamped), p. 23 (penned)], dwelling 198, family 159, Benj Robinson; database with images, <i>FamilySearch</i> (https://familysearch.org/ark:/61903/1:1:MCP7-MVY : 22 July 2018); citing National Archives microfilm publication M653, roll 1049; Family History Library microfilm 805,049.
As you can see both the index and the image citation do not give all the needed information for the evidence explained model for 1860.
Now for 1870 (Same household)
- Index: "United States Census, 1870," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:M6K4-TG7 : 12 April 2016), Benjiman Robinson, Ohio, United States; citing p. 18, family 120, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,670.
Image: "United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:S3HY-DCT3-VS3?cc=1438024&wc=92K2-6TY%3A518654901%2C519738801%2C519739301 : 22 May 2014), Ohio > Athens > Ames > image 18 of 27; citing NARA microfilm publication M593 (Washington, D.C.: National Archives and Records Administration, n.d.).
Modified Evidence Explained: 1870 U.S. census, Athens County, Ohio, population schedule, Amesville, Ames Township, [https://www.familysearch.org/ark:/61903/3:1:S3HY-DCT3-VS3?i=17&cc=1438024 p. 29 B (stamped), p. 18 (penned)], dwelling 143, family 120, Benjiman Robinson; database with images, <i>FamilySearch</i> (https://familysearch.org/ark:/61903/1:1:M6K4-TG7 : accessed 22 July 2018); citing National Archives microfilm publication M593, roll 1171; Family History Library microfilm 552,670.