Social Darwinism in European and American Thought, 1860-1945: Nature as Model and Nature as Threat (1997), authored by Mike Hawkins, delves into how both individual thinkers and broader social groups understand and interpret the theories of Social Darwinism. The book also scrutinizes the traditional and revisionist perspectives that historians have adopted regarding Social Darwinism.

Modern Man in Search of a Soul (1933) encapsulates many of Carl Jung's psychoanalytical ideas. Jack London discovered Jung's work later in his life and found that many of Jung's concepts resonated with his own beliefs. Particularly, Jung's notion of the "collective unconscious" had already been foreshadowed in The Call of the Wild.

Rudyard Kipling's The Jungle Book (1895) is a compilation of tales centered around Mowgli, a young boy nurtured by wolves. Set in the Indian jungles, the stories feature a variety of talking animals who impart important lessons to Mowgli. These stories were among the most beloved animal tales for children when London penned The Call of the Wild.

Martin Eden (1909) stands as London's most autobiographical novel. It narrates the journey of a young man who ascends from poverty to achieve fame as an internationally renowned author.

In The Road (1907), London recounts his early experiences as a tramp and charts his evolution from a hobo and "blond-beastly" adventurer to a writer and socialist.

White Fang (1906), often seen as a companion to The Call of the Wild, tells the story of a wild dog that becomes domesticated, contrasting with Buck's journey in the latter.

Frank Norris's McTeague (1899) exemplifies naturalism, depicting how heredity and environment shape the destinies of ill-fated individuals in turn-of-the-century San Francisco.