Citazione Stile APA (7a Edizione)

Hui, L. S., & Ong, P. S. (1987). Secondary school geography (Repr.). Pan Pacific Book Distributors [u.a.

Citazione stile Chigago Style (17a edizione)

Hui, Lee Suat, e Pin Sam Ong. Secondary School Geography. Repr. Singapore: Pan Pacific Book Distributors [u.a, 1987.

Citatione MLA (9a ed.)

Hui, Lee Suat, e Pin Sam Ong. Secondary School Geography. Repr. Pan Pacific Book Distributors [u.a, 1987.