MLA

Great Britain. Hydrographic Dept, Potter, and J. D. Australia East Coast. Sheet IV, Broken Bay to Sugarloaf Point / from a Running Survey by Captn. J. Lort Stokes ... 1851 ; Engraved by J. & C. Walker. Published according to Act of Parliament at the Hydrographic Office of The Admiralty :, Sold by J.D. Potter Agent for the Admiralty charts 31 Poultry, 0AD. https://collections.library.yale.edu/catalog/15237610.

APA, 6th edition

Great Britain. Hydrographic Dept, P., & D, J. (0 C.E.). Australia east coast. Sheet IV, Broken Bay to Sugarloaf Point / from a running survey by Captn. J. Lort Stokes ... 1851 ; engraved by J. & C. Walker. [Maps, Nautical charts]. Published according to Act of Parliament at the Hydrographic Office of The Admiralty :, Sold by J.D. Potter Agent for the Admiralty charts 31 Poultry, https://collections.library.yale.edu/catalog/15237610.