Wolters, P. H. The Bussard: P. H. Wolters. Schroën.
Lua i Stíl Chicago (17ú heag.)Wolters, Peter Hubert. The Bussard: P. H. Wolters. Heythuysen, Holland: Schroën.
Lua MLA (8ú heag.)Wolters, Peter Hubert. The Bussard: P. H. Wolters. Schroën.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.