"Dipl.-Ing. Martin Heide has retired". Alexander Schleicher GmbH & Co. Segelflugzeugbau. 28 June 2018. Retrieved 2 January 2019. To date, 258 motorgliders of this type have left the Schleicher workshops.
"ASH 26 E / ASH 26 Brochure"(PDF). Alexander Schleicher GmbH & Co. Segelflugzeugbau. 14 March 2004. Retrieved 2 January 2019.