Zweigert, Konrad, 1911
North-Holland Pub. Co. ; New York : distributors for the U.S.A. and Canada, Elsevier North-Holland, 1977
Buku Teks
C.F.G. Sunaryati Hartono, 1931-, author
Fakultas Hukum Universitas Padjadjaran, 1974
Buku Teks
Ehrmann, Henry W., author
Prentice-Hall, 1976
Buku Teks
Cruz, Peter de
Kluwer, 1993
Buku Teks
Schlesinger, Rudolf B.
Stevens & Sons , 1960
Buku Klasik