"Hearts of the World" is referenced in L. M. Montgomery's novel set during World War I, "Rilla of Ingleside". Rilla recalls in her diary, "The heroine was struggling with a horrible German soldier who was trying to drag her away. I knew she had a knife—I had seen her hide it, to have it in readiness—and I couldn't understand why she didn't produce it and finish the brute. I thought she must have forgotten it, and just at the tensest moment of the scene I lost my head altogether. I just stood right up on my feet in that crowded house and shrieked at the top of my voice—'The knife is in your stocking—the knife is in your stocking!'"