(en) Michael Matthew Kaylor, Secreted Desires: The Major Uranians: Hopkins, Pater and Wilde, Masaryk University (re-published in electronic format), , electronic éd. (ISBN978-80-210-4126-4, lire en ligne), footnote 2 in page 235
(en) Jack B. Oruch, « St. Valentine, Chaucer, and Spring in February », Speculum, The University of Chicago Press, vol. 56, no 3, , p. 534-565 (DOI10.2307/2847741, JSTOR2847741)
(en) Jack B. Oruch, « St. Valentine, Chaucer, and Spring in February », Speculum, The University of Chicago Press, vol. 56, no 3, , p. 534-565 (DOI10.2307/2847741, JSTOR2847741)