The following links and attachments are for reviews of Parable of the Sower from the time it was orginally published:
Book Reviews: Parable of the Sower (The Black Scholar, 1994)
EBSCO Literary Reference Center
Parable of the Sower and Parable of the Talents (Masterplots, 2010)
Octavia Butler's Parables (Scraps of Untainted Sky: Science Fiction, Utopia, and Dystopia, 2000)
Parable of the Sower and Parable of the Talents (Masterplots II: African American Literature, 2008)
JSTOR
Speculative Archives: Histories of the Future of Education (Pacific Coast Philology, 2014)
These articles discuss some of the lasting impacts and attitudes regarding Parable
A Prescient Sci-Fi 'Parable' Gets Set to Music (NY Times, 2018)