Society of Professional Engineers of Papua New Guinea. (1990). Regulations made under section 9.8 of the constitution of the Society of Professional Engineers of Papua New Guinea ([Rev. ed.].). The Society.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)Society of Professional Engineers of Papua New Guinea. Regulations Made Under Section 9.8 of the Constitution of the Society of Professional Engineers of Papua New Guinea. [Rev. ed.]. Port Moresby: The Society, 1990.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)Society of Professional Engineers of Papua New Guinea. Regulations Made Under Section 9.8 of the Constitution of the Society of Professional Engineers of Papua New Guinea. [Rev. ed.]. The Society, 1990.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.