APA
(1973). Coal, the basis of nineteenth-century technology by cosin A Russell. Block11. unit 4. : Open University Press.
Chicago
1973. Coal, the basis of nineteenth-century technology by cosin A Russell. Block11. unit 4. : Open University Press.
Harvard
(1973). Coal, the basis of nineteenth-century technology by cosin A Russell. Block11. unit 4. : Open University Press.
MLA
Coal, the basis of nineteenth-century technology by cosin A Russell. Block11. unit 4. : Open University Press. 1973.
