Savaitės klausomiausi (TOP 100)" (in Lithuanian). AGATA. September 16, 2019 . Retrieved November 30, 2019.

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. 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.American album certifications – Melanie Martinez – K-12". Recording Industry Association of America . Retrieved September 16, 2021. Oficjalna lista sprzedaży:: OLiS - Official Retail Sales Chart". OLiS. Polish Society of the Phonographic Industry. Retrieved September 19, 2019. EESTI TIPP-40 MUUSIKAS: Ohhoo! Madison Mars ja Liis Lemsalu ründavad räpparite hirmuvalitsust!". Eesti Ekspress (in Estonian) . Retrieved September 18, 2019. Wass, Mike (January 8, 2020). "Melanie Martinez Teases New EP, Which Is Probably Called 'After School' ". Idolator . Retrieved July 7, 2021.

K-12 CD/DVD Melanie Martinez". Melaniemartinez.com . Retrieved July 23, 2019. [ permanent dead link] Melanie Martinez teases 'K-12' era with eerie video, album art". Alternative Press. May 16, 2019 . Retrieved May 30, 2019. Gamboa, Glenn (May 23, 2019). "LI Sound: Melanie Martinez readying new album, movie". Newsday . Retrieved May 30, 2019.

Versions

a b "Credits / K-12 (After School – Deluxe Edition) / Melanie Martinez – TIDAL". Tidal . Retrieved September 25, 2020. An accompanying music film of the same name, written and directed by Melanie herself, made its cinema debut in Los Angeles on September 3rd and then in select cinemas worldwide on September 5th. It was later posted on YouTube. British album certifications – Melanie Martinez – K-12". British Phonographic Industry . Retrieved February 25, 2022. a b "K-12 (Exclusive Mint Colored Vinyl)". Melaniemartinez.com . Retrieved July 23, 2019. [ permanent dead link] Aniftos, Rania (September 22, 2020). "Post Malone Leads 2020 Billboard Music Awards Nominations With 16: Full List". Billboard. ISSN 0006-2510 . Retrieved September 22, 2020.