APA
Worthington J. (., . (1979). Know how; Book- 9. London: Orbis Publishing Limited.
Chicago
Worthington Julian (ed), . 1979. Know how; Book- 9. London: Orbis Publishing Limited.
Harvard
Worthington J. (., . (1979). Know how; Book- 9. London: Orbis Publishing Limited.
MLA
Worthington Julian (ed), . Know how; Book- 9. London: Orbis Publishing Limited. 1979.