Drake, R.E.; Green, A.I.; Mueser, K.T. (2003). "The History of Community Mental Health Treatment and Rehabilitation for Persons with Severe Mental Illness". Community Mental Health Journal. 39. doi:10.1023/A:102586091 (tidak aktif 2020-01-22).
Steinberg, Peter K. (Summer 2012). "Textual Variations in The Bell Jar Publications". Plath Profiles: An Interdisciplinary Journal for Sylvia Plath Studies (dalam bahasa English). Indiana University. 5: 134–139. Diakses tanggal June 8, 2018.Pemeliharaan CS1: Bahasa yang tidak diketahui (link)
McCullough, Frances (2015). The Bell Jar (dalam bahasa Inggris). HarperCollins. hlm. Foreword. ISBN978-0-06-244447-9.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Correspondence with Frank O Connor & Seán Ó Faoláin"Salinan arsip". Archived from the original on 2007-06-07. Diakses tanggal 2020-05-29.Pemeliharaan CS1: Url tak layak (link) , "O'Connor [traveled] to the States to give his famous course on Irish Literature at Harvard (Sylvia Plath was an aspiring student whom he refused a place on his course to)."