The original caption for this photograph reads: President Barack Obama, First Lady Michelle Obama, and daughters Sasha and Malia tour the Martin Luther King, Jr. National Memorial in Washington, D.C.
This primary source comes from the BHO-WHPO: Records of the White House Photo Office (Obama Administration).
Full Citation: President Barack Obama Tours the Martin Luther King, Jr. National Memorial in Washington, D.C.; 10/14/2011; P101411PS-0743; Presidential Photographs, 1/20/2009 - 1/20/2017; BHO-WHPO: Records of the White House Photo Office (Obama Administration); Barack Obama Presidential Library, Hoffman Estates, IL. [Online Version, https://www.docsteach.org/documents/document/president-barack-obama-tours-martin-luther-king-memorial, April 29, 2024]