Burde, G., Zieschang, H., & Heusener, M. (2013). Knots (Third, fully revised and extended edition.). Walter de Gruyter GmbH & Co. KG.
Lua i Stíl Chicago (17ú heag.)Burde, Gerhard, Heiner Zieschang, agus Michael Heusener. Knots. Third, fully revised and extended edition. Berlin ; Boston: Walter de Gruyter GmbH & Co. KG, 2013.
Lua MLA (9ú heag.)Burde, Gerhard, et al. Knots. Third, fully revised and extended edition. Walter de Gruyter GmbH & Co. KG, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.