MLA

Drummond, William, Sir, 1770?-1828. The journal of the right honble. Sir William Drummond, K.C. member of the Privy Council. Tour through Germany, Italy & France 21st. Augt. to 9th. Novr. 1787, 1787 Aug 21 - Nov 9.. 1787 Aug 21 - Nov 9.. https://collections.library.yale.edu/catalog/16813284.

APA, 6th edition

Drummond, William, Sir, 1770?-1828. (1787 Aug 21 - Nov 9.)[The journal of the right honble. Sir William Drummond, K.C. member of the Privy Council. Tour through Germany, Italy & France 21st. Augt. to 9th. Novr. 1787, 1787 Aug 21 - Nov 9.]. https://collections.library.yale.edu/catalog/16813284.