RUJUKAN
ALASIA PAWA. (2015, August 18). KEMAHIRAN PROSES SAINS [Video file]. Retrieved from https://www.youtube.com/watch?v=PRjHgegfcOY
Alias Abdullah. (2016). XPRESS ASASI UPSR Sains. Petaling Jaya: Sasbadi Sdn. Bhd.
Arisyah Azha. (2016, September 5). SISTEM SURIA [Video file]. Retrieved from https://www.youtube.com/watch?v=MBxuAPTWZFM
Cikgu Kool. (2016, March 21). Muat Turun Nota & Ringkasan Buku Teks Dunia Sains & Teknologi Sekolah Rendah – Cikgu Share. Retrieved from http://www.cikgushare.com/2016/03/muat-turun-nota-ringkasan-buku-teks.html
Edunationmalaysia. (2016, January 7). 5.1 EN: Gerak Balas Tumbuhan [Video file]. Retrieved from https://www.youtube.com/watch?v=Ot7vsGsyxVw
Idwal Systems (Firm). (2001). Sains Tahun 4. Selangor: Idwal System.
Kerrie Hughes. (2016, July 29). 20 brilliant WordPress tutorials | Creative Bloq. Retrieved from http://www.creativebloq.com/web-design/wordpress-tutorials-designers-1012990
Mata Pelajaran Tahun 3. (2013, March 25). SAINS : Tahun 4 – Pengukuran [Video file]. Retrieved from https://www.youtube.com/watch?v=Ak-wdMUsObw
Shariff Syapruddin. (2014, April 12). Sains Tahun 4 (KSSR) : Organ Pernafasan Haiwan [Video file]. Retrieved from https://www.youtube.com/watch?v=1S682sTED6w
Spicaland blog. (2003, December 28). Animasi Sistem Pernafasan [Video file]. Retrieved from https://www.youtube.com/watch?v=UM1-w8F96oo
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