California Code
TITLE 1 - DEFINITION OF OBLIGATIONS
Section [1428.].

[1428.]
 Section Fourteen Hundred and Twenty-eight. An obligation arises either from:
One—The contract of the parties; or,

Two—The operation of law. An obligation arising from operation of law may be enforced in the manner provided by law, or by civil action or proceeding.

(Amended by Code Amendments 1873-74, Ch. 612.)