Brook Lapping Productions. (2009). Working with formulae. Teachers TV/UK Dept. of Education.
Chicago Style (17th ed.) CitationBrook Lapping Productions. Working with Formulae. [London]: Teachers TV/UK Dept. of Education, 2009.
MLA (9th ed.) CitationBrook Lapping Productions. Working with Formulae. Teachers TV/UK Dept. of Education, 2009.
Warning: These citations may not always be 100% accurate.