Broe, Mary Lynn, Protean Poetic: The Poetry of Sylvia Plath, University of Missouri Press, 1980.

Broe attempts to demythologize Plath in this study
of the themes and techniques in her poetry.

Davison, Peter, The Fading Smile: Poets in Boston from Robert Lowell to Sylvia Plath, W. W. Norton & Company, 1996.

Davison recounts the Boston poetry world of the mid-
1950s in this memoir, describing the complex relationships
among poets such as Robert Lowell,
Anne Sexton, Sylvia Plath, Richard Wilbur, and
W. S. Merwin.

Malcolm's controversial "biography" addresses how
Plath's reputation developed after she had died. Malcolm
examines the complex and complicated relationship
Plath's ex-husband, Ted Hughes, had with
Plath's estate, and the steps he took to protect his
own privacy.

Rosenblatt, Jon, Sylvia Plath: The Poetry of Initiation, University of North Carolina Press, 1979.

Arguing that criticism on Plath...