APA (7th ed.) Citation

(2009). Combined Mathematics G.C.E. (A/L): Grade 12 - teacher's instructional manual. National Institute of Education.

Chicago Style (17th ed.) Citation

Combined Mathematics G.C.E. (A/L): Grade 12 - Teacher's Instructional Manual. Maharagama: National Institute of Education, 2009.

MLA (9th ed.) Citation

Combined Mathematics G.C.E. (A/L): Grade 12 - Teacher's Instructional Manual. National Institute of Education, 2009.

Warning: These citations may not always be 100% accurate.