Follow the LC subject headings for relevant books listed in the above reference sources.
Start with a word/s anywhere search:
danc* and history (the * = truncation = dance or dancing or dancers...)
shakespeare and danc*
stravinsky and (ballet or danc*)
ritual and danc* and asia*
postmodern and danc*
danc* and "social change"
india and folk danc*
If too many items are retrieved with the word/s anywhere search, revise the search and conduct a subject word/s search
Follow the LC Subject Headings and the sub-divisions
modern danceFor a PERSON:
The broadest strategy = using the word/s anywhere search and placing the person's name in quotes: "mark morris". Depending on the person, you will need to add keywords to make sure you retrieve the correct person: (danc* or choreograph*) 
In addition, again, depending on the person and how much is written about them, you can search by subject and then look at the sub-divisions:
