Julie S. McCrae. (2009). Emotional and Behavioral Problems Reported in Child Welfare Over 3 Years. Tesis sarjana. University of Pittsburgh, Pennsylvania.

Victoria R. Jacobs, Lisa L. C. Lamb, and Randolph A. Philipp. (2010). Profesional Noticing of Childrens Mathematical Thinking. Tesis sarjana. San Diego State University.

Akhsanul Inam, Noor Shad Saad, Sazelli Abdul Ghani. (2012). Pembangunan Model Pengajaran Dan Pembelajaran Matematik Berasaskan Metakognitif. Tesis sarjana. Universiti Pendidikan Sultan Idris- Malaysia.

Stuart E. Bell. (t.t). Pattern, Area dan Perimeter. Exeter: Longman Sdn. Bhd.

Sybilla Beckmann. (2005). Mathematics for Elementary Teachers. United States of America: Pearson Education.

Mohamad Khairuddi bin Yahya, Marzita binti Puteh, & Santhi Periassamy. (2006). Mathematics Textbooks Year 5. Kuala Lumpur: Dewan Bahasa Dan Pustaka.

Mrs. Glosser's Math Goodies. (2014). Perimeter. Dicapai pada 20 Ogos 2014 daripada http://www.mathgoodies.com/lessons/vol1/perimeter.html

Michael Bach. (2014). Optical Illusions & Visual Phenomena- 113 of them. Dicapai pada 20 Ogos 2014 daripada http://www.michaelbach.de/ot/

Jamie Frater. (2007). 20 Amazing Optical Illusions. Dicapai pada 20 Ogos 2014 daripada http://listverse.com/2007/09/16/20-amazing-optical-illusions/

Michael Bach. (2014). Optical Illusions & Visual Phenomena- 113 of them.

Jamie Frater. (2007). 20 Amazing Optical Illusions.

SasaranMrs. Glosser's Math Goodies. (2014). Perimeter.

Julie S. McCrae. (2009). Emotional and Behavioral Problems Reported in Child Welfare Over 3 Years. Tesis sarjana. University of Pittsburgh, Pennsylvania.

Mohamad Khairuddi bin Yahya, Marzita binti Puteh, & Santhi Periassamy. (2006). Mathematics Textbooks Year 5. Kuala Lumpur: Dewan Bahasa Dan Pustaka.