Topographical Plan of part of the Revolutionary Camp Grounds at Valley Forge, Pennsylvania, comprising the Inner Lines of Entrenchments, Redoubts and defences Dec. 19, 1777 - June 19, 1778.
MLA
Topographical Plan of Part of the Revolutionary Camp Grounds at Valley Forge, Pennsylvania, Comprising the Inner Lines of Entrenchments, Redoubts and Defences Dec. 19, 1777 - June 19, 1778. Valley Forge Park Commission, 0AD. https://collections.library.yale.edu/catalog/15811163.
APA, 6th edition
Topographical Plan of part of the Revolutionary Camp Grounds at Valley Forge, Pennsylvania, comprising the Inner Lines of Entrenchments, Redoubts and defences Dec. 19, 1777 - June 19, 1778. (0 C.E.). [Maps]. Valley Forge Park Commission, https://collections.library.yale.edu/catalog/15811163.