The Research Connections collection contains records for more than 1,300 instruments that have been used to conduct studies in the child care and early education field. This bibliography provides records for instruments in the collection that can be used to observe child care quality in center-based settings serving infants and toddlers. In addition to citations and descriptions for the various versions of instruments, this bibliography contains links to all of the studies in the Research Connections collection that have used that instrument. (author abstract)