APA (7th ed.) Citation

Perera, L. e., Navaratna, A. A. e., Perera, G. M. T. N. e., & Vedemulla, A. e. (2003). English language: Practice test for the G.C.E.(O/L) examination.

Chicago Style (17th ed.) Citation

Perera, Lal ed, A. A. ed Navaratna, G. M. T. N. ed Perera, and Arther ed Vedemulla. English Language: Practice Test for the G.C.E.(O/L) Examination. 2003.

MLA (9th ed.) Citation

Perera, Lal ed, et al. English Language: Practice Test for the G.C.E.(O/L) Examination. 2003.