Principles of communications satellites / Gary D. Gordon, Walter L. Morgan.

Economic regulation of business cases and material/ Thomas D. Morgan

Moe, menjadi orang tua efektif dalam praktek = P.E.T. in action / Thomas Gordon bersama Gordon Sands ; penerjemah Alex Tri Kantjono Widodo

The world order: socialist perspectives / edited by Ray Bush, Gordon Johnston and

P.E.T. : parent effectiveness training : the tested new way to raise responsible children / Thomas Gordon