APA

West African Examinations Council, . (1972). Notes on SI units, signs, symbols and abbreviations for use in schoo l certificate/General Certificate of Education, Ordinary Level and Adva nced Level science and the West African Examinations Council. [s.l]: West African Examinations Council.

Chicago

West African Examinations Council, . 1972. Notes on SI units, signs, symbols and abbreviations for use in schoo l certificate/General Certificate of Education, Ordinary Level and Adva nced Level science and the West African Examinations Council. [s.l]: West African Examinations Council.

Harvard

West African Examinations Council, . (1972). Notes on SI units, signs, symbols and abbreviations for use in schoo l certificate/General Certificate of Education, Ordinary Level and Adva nced Level science and the West African Examinations Council. [s.l]: West African Examinations Council.

MLA

West African Examinations Council, . Notes on SI units, signs, symbols and abbreviations for use in schoo l certificate/General Certificate of Education, Ordinary Level and Adva nced Level science and the West African Examinations Council. [s.l]: West African Examinations Council. 1972.