Marsden, S., & Spearritt, P. (2021). The twentieth-century historic thematic framework: : a tool for assessing heritage places. : Getty Conservation Institute.
Chicago Style (17th ed.) CitationMarsden, Susan, and Peter Spearritt. The Twentieth-century Historic Thematic Framework: : A Tool for Assessing Heritage Places. Los Angeles: : Getty Conservation Institute, 2021.
MLA (9th ed.) CitationMarsden, Susan, and Peter Spearritt. The Twentieth-century Historic Thematic Framework: : A Tool for Assessing Heritage Places. : Getty Conservation Institute, 2021.
Warning: These citations may not always be 100% accurate.