Não informado. (1984). Classical and Quantum Gravity. Institute of Physics.
Lua i Stíl Chicago (17ú heag.)Não informado. Classical and Quantum Gravity. Bristol, Inglaterra: Institute of Physics, 1984.
Lua MLA (8ú heag.)Não informado. Classical and Quantum Gravity. Institute of Physics, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.