CBAC UG Hanes – Canllaw i Fyfyrwyr Uned 2: Weimar a'i Sialensiau, tua 1918–1933 (WJEC AS-level History Student Guide Unit 2: Weimar and its challenges c.1918-1933 (Welsh-language edition) Holt Gareth Heftet / 2020 / Engelsk
WJEC A-level History Student Guide Unit 4: Nazi Germany c.1933-1945 Holt Gareth Heftet / 2019 / Engelsk
CBAC Safon Uwch Hanes – Canllaw i Fyfyrwyr Uned 4: Yr Almaen Natsïaidd, tua 1933–1945 (WJEC A-level History Student Guide Unit 4: Nazi Germany c.1933-1945: Welsh language edition) Holt Gareth Heftet / 2020 / Engelsk
WJEC AS-level History Student Guide Unit 2: Weimar and its challenges c.1918-1933 Holt Gareth Heftet / 2019 / Engelsk