The Jacobson Center for Writing, Teaching and Learning offers individual help with writing and also this useful guide:
Writing Papers: A Handbook for Students at Smith College, 5th edition, 2016
Read "How to Acknowledge" starting on page 57 (pg. 67 of 96 in pdf file).
Useful guides from trusted libraries:
Up-to-date style guides are available in Young Library's Reference section. If you need more help, make an appointment with a reference librarian or Ask Us, or use Smith's Citation Guides & Style Manuals help pages, or try online software - RefWorks (Smith subscription) or ZOTERO (open-source).