Ryan, Helen. Commercial law in principle / by Helen Ryan, Andy Gibson, Sophie Rigby , Gary Tamsitt. - 1st ed. - Sydney : Lawbook, 2001. - 1 v. ; 24cm. Includes index. ISBN: 0455217602 Subjects--Topical Terms: Commercial law--Australia--Problems, exercises, etc. Dewey Class. No.: 346.9407 RY CO