Gaya APA

Beatty, K. (2008). Environmental Protection: 9 SFLEP Longman Secondary English Graded Readers . Hong Kong: Pearson Longman.

Gaya MLA

Beatty, Ken. "Environmental Protection: 9 SFLEP Longman Secondary English Graded Readers". Hong Kong: Pearson Longman, 2008. GEN - Bacaan/Seri Non-Fiksi.