Παραπομπή APA

Productivity Services International. (1971). Handbook of 100 new small industry schemes. Air conditioned.

Παραπομπή Chicago Style

Productivity Services International. Handbook of 100 New Small Industry Schemes. Tardeo: Air conditioned, 1971.

Παραπομπή MLA

Productivity Services International. Handbook of 100 New Small Industry Schemes. Air conditioned, 1971.