The Professor Challenger stories:
The lost world, The poison belt, The land of mist, The disintegration machine, When the world screamed.
APA Citation
Doyle, A. Conan. (1952). The Professor Challenger stories: The lost world, The poison belt, The land of mist, The disintegration machine, When the world screamed. [1st ed.] London: Murray.
MLA Citation
Doyle, Arthur Conan, 1859-1930. The Professor Challenger Stories: The Lost World, The Poison Belt, The Land of Mist, The Disintegration Machine, When the World Screamed. [1st ed.] London: Murray, 1952.
Warning: These citations may not always be complete (especially for serials).