The Time Machine by H.G. Wells must have been required reading for the Defenders. The characters discussed the 1895 novella without directly stating the title.
To escape from a horde of vampires in Defenders #95 (May 1981), Daimon Hellstrom recited an ancient chant to safely move his teammates several hours into the future. Afterward, Gargoyle asked if they had traveled through time like H.G. Wells. Hellstrom explained that they did travel through time, though not precisely in the way Gargoyle imagined.
When Dr. Strange suggested sending Spider-Man 20,000 years backward through time in Marvel Team-Up #112 (Dec. 1981), the wall-crawler said in jest that he was not H.G. Wells. Dr. Strange clarified that he intended to send Spider-Man's astral form to the ancient past while keeping his physical body in the present. The purpose of the mission was to find a cure to an illness Spider-Man contracted from the reptile cult in #111.