„Umlauts are written a little differently in this puzzle: ä = ae, ö = oe, ü = ue and ß = ss.“ — Educaplay Crossword: Greetings, Farewells & Basics, Zugriff am 17. Mai 2025
Шрифт Зюттерлина (неопр.). // ИнъязСервис. Дата обращения: 26 ноября 2011. Архивировано из оригинала 19 января 2012 года.
scsa.wa.edu.au
k10outline.scsa.wa.edu.au
„Understanding that ß can only be used in lower case, otherwise SS and that ä, ö and ü can be written as ae, oe and ue respectively, for example, in upper case signs or word puzzles such as crosswords.“ — School Curriculum and Standards Authority, Western Australia, Zugriff am 17. Mai 2025