Kusumawati, Lanny and Pentony, Brendan and Graw, Stephen and Jann, Lennard and Parker, David (2006) Hukum Kontrak 2 (Versi Common Law). Laros, Sidoarjo. ISBN 979-25-6312-1
Kusumawati, Lanny and Pentony, Brendan and Graw, Stephen and Jann, Lennard and Parker, David (2006) Hukum Kontrak 1. Laros, Sidoarjo. ISBN 979-25-6311-3