Gaya APA
HELLER,Robet, . (1970).
The Business of Winning; how to succed in business by really trying .
London:
Sidgurick &Jackson.
Gaya MLA
HELLER,Robet, .
"The Business of Winning; how to succed in business by really trying".
London:
Sidgurick &Jackson,
1970.
Text.