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Wass, Mike (January 8, 2020). "Melanie Martinez Teases New EP, Which Is Probably Called 'After School' ". Idolator . Retrieved March 17, 2020. Selected items are only available for delivery via the Royal Mail 48® service and other items are available for delivery using this service for a charge. Martinez, Melanie; Torvinen, Alissa (September 5, 2019), K-12 (Fantasy, Horror, Musical), Atlantic Records, Little Ugly , retrieved July 30, 2022
Samways, Gemma (February 18, 2020). "Melanie Martinez review: Pop princess loses her way in fairytale settings". Evening Standard . Retrieved June 7, 2021.EESTI TIPP-40 MUUSIKAS: Ohhoo! Madison Mars ja Liis Lemsalu ründavad räpparite hirmuvalitsust!". Eesti Ekspress (in Estonian) . Retrieved September 18, 2019.
Kim, Madeline (February 16, 2020). "Melanie Martinez - After School". The Tartan . Retrieved March 17, 2020.Despite no singles being released prior to the album, K–12 debuted at number three on the US Billboard 200 with 57,000 album-equivalent units, of which 30,000 were pure album sales. It is Martinez's second US top-10 album [33] Additionally it topped the alternative album chart becoming her second consecutive top charter. Elsewhere the album reached the top 10 of eight different countries including the UK, Australia and Canada. Melanie Martinez Setlist at Jimmy Kimmel Live, Los Angeles". setlist.fm . Retrieved October 18, 2020.