Guyer, W. (1932). Pestalozzi: Walter Guyer. Huber.
Lua i Stíl Chicago (17ú heag.)Guyer, Walter. Pestalozzi: Walter Guyer. Frauenfeld [u.a.]: Huber, 1932.
Lua MLA (8ú heag.)Guyer, Walter. Pestalozzi: Walter Guyer. Huber, 1932.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.