Sportiche, Dominique, author
Wiley Blackwell, 2014
Buku Teks
Eyges, Leonard, author
Dover Publication. Inc, 2015
Buku Teks
Achmad Fahrurozi, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2009
UI - Skripsi (Membership)
Dirac, P. A. M.
John Wiley & Sons, 1975
Buku Teks
Buchdahl, H.A., author
John Wiley & Sons, 1981
Buku Teks