Walker, J., & Walker, C. (1887). The South Shetland and South Orkney Islands with the tracks of the several discoverers 1819 to 1843. London.
Chicago Style (17th ed.) CitationWalker, J., and C. Walker. The South Shetland and South Orkney Islands with the Tracks of the Several Discoverers 1819 to 1843. London, 1887.
MLA (9th ed.) CitationWalker, J., and C. Walker. The South Shetland and South Orkney Islands with the Tracks of the Several Discoverers 1819 to 1843. London, 1887.
Warning: These citations may not always be 100% accurate.