APA

Bureau of International Information Programs (U.S. Department of State), Clack G., .USA history in brief. United States: Global Publishing Solutions.

Chicago

Bureau of International Information Programs (U.S. Department of State), Clack George, .USA history in brief. United States: Global Publishing Solutions.

Harvard

Bureau of International Information Programs (U.S. Department of State), Clack G., .USA history in brief. United States: Global Publishing Solutions.

MLA

Bureau of International Information Programs (U.S. Department of State), Clack George, .United States: Global Publishing Solutions. .