Lucassen, S. (2017). The use of animals in circuses and shows in Denmark, Sweden, Norway and Finland. Universitat Autònoma de Barcelona.
Lua i Stíl Chicago (17ú heag.)Lucassen, Sacha. The Use of Animals in Circuses and Shows in Denmark, Sweden, Norway and Finland. Universitat Autònoma de Barcelona, 2017.
Lua MLA (9ú heag.)Lucassen, Sacha. The Use of Animals in Circuses and Shows in Denmark, Sweden, Norway and Finland. Universitat Autònoma de Barcelona, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.