Koster, J. P. (1984). Formal rythmics.
Lua i Stíl Chicago (17ú heag.)Koster, Jan Pieter. Formal Rythmics. 1984.
Lua MLA (8ú heag.)Koster, Jan Pieter. Formal Rythmics. 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.