Poetry Foundation: Sylvia Plath
https://www.poetryfoundation.org/poets/sylvia-plath
Contains a biography of Sylvia Plath and an introduction to Ariel.
Oxford Bibliographies: Sylvia Plath
https://www.oxfordbibliographies.com/view/document/obo-9780199827251/obo-9780199827251-0016.xml
A biography and bibliography on Plath.
"The Munich Mannequins" by Sylvia Plath
https://genius.com/Sylvia-plath-the-munich-mannequins-annotated
Full text of "The Munich Mannequins," another moon-related poem in Ariel.
"The Rival" by Sylvia Plath
https://genius.com/Sylvia-plath-the-rival-annotated
Full text of "The Rival," another moon-related poem in Ariel.
