(2009). G. C. E. (Advanced Level) Business Statistics - grade 12: Teacher's instructional manual (implemented from year 2009). National Institute of Education.
Chicago Style (17th ed.) CitationG. C. E. (Advanced Level) Business Statistics - Grade 12: Teacher's Instructional Manual (implemented from Year 2009). Maharagama: National Institute of Education, 2009.
MLA (9th ed.) CitationG. C. E. (Advanced Level) Business Statistics - Grade 12: Teacher's Instructional Manual (implemented from Year 2009). National Institute of Education, 2009.
Warning: These citations may not always be 100% accurate.