Gaya APA

John, E., Julia, H. (1989). The Green Consumer Guide : From Shampoo to Champagne (Cetakan Pertama). london: Voctor Gollancz Ltd.

Gaya MLA

John, Elkington., Julia, Hailes. "The Green Consumer Guide : From Shampoo to Champagne". Cetakan Pertama london: Voctor Gollancz Ltd, 1989. Text.