1. Alcobia-Murphy, Shane. Sympathetic Ink: Intertextual Relations in Northern Irish Poetry. Liverpool: Liverpool University Press, 2006.
2. Allen Randolph, Jody. Eavan Boland. Cork: Cork University Press, 2014.
3. Bachelard, Gaston. The Poetics of Space. Translated by Maria Jolas. Boston: Beacon Press, 1994.
4. Billone, Amy Christine. Little Songs: Women, Silence, and the Nineteenth-Century Sonnet. Columbus: The Ohio State University, 2007.
5. Cage, John. Silence. Middletown, CT: Wesleyan University Press, 1961.