APA

staffored l., . (1977). modern comercial knowledge. london: macdonald and evans ltd.

Chicago

staffored l.w.t, . 1977. modern comercial knowledge. london: macdonald and evans ltd.

Harvard

staffored l., . (1977). modern comercial knowledge. london: macdonald and evans ltd.

MLA

staffored l.w.t, . modern comercial knowledge. london: macdonald and evans ltd. 1977.