Style de citation APA

Productivity Services International. (1971). Fortune-making in your spare time: Seventy propositions. Productivity services international.

Style de citation Chicago

Productivity Services International. Fortune-making in Your Spare Time: Seventy Propositions. Bombay: Productivity services international, 1971.

Style de citation MLA

Productivity Services International. Fortune-making in Your Spare Time: Seventy Propositions. Productivity services international, 1971.