(1997). Apa & mengapa: Bumi Kita (6). Piramid Perdana (M) Sdn.Bhd..
Chicago Style (17th ed.) CitationApa & Mengapa: Bumi Kita (6). Selangor: Piramid Perdana (M) Sdn.Bhd., 1997.
MLA (9th ed.) CitationApa & Mengapa: Bumi Kita (6). Piramid Perdana (M) Sdn.Bhd., 1997.
Warning: These citations may not always be 100% accurate.