Παραπομπή σε μορφή APA (7η εκδ.)

Unsworth, J. F., Barratt, D. J., & Roberts, P. T. (1991). Coal quality and comustion performance: An international perspective. Shell Research.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Unsworth, John F., David J. Barratt, και Peter T. Roberts. Coal Quality and Comustion Performance: An International Perspective. Amserdam: Shell Research, 1991.

Παραπομπή σε μορφή MLA (8th εκδ.)

Unsworth, John F., et al. Coal Quality and Comustion Performance: An International Perspective. Shell Research, 1991.