Philippine Press Institute & San Miguel Corporation. (1968). Clear effective writing: A PPI manual. Philippine Press Institute and the San Miguel Corporation.
Chicago Style (17th ed.) CitationPhilippine Press Institute and San Miguel Corporation. Clear Effective Writing: A PPI Manual. [Manila]: Philippine Press Institute and the San Miguel Corporation, 1968.
MLA (9th ed.) CitationPhilippine Press Institute and San Miguel Corporation. Clear Effective Writing: A PPI Manual. Philippine Press Institute and the San Miguel Corporation, 1968.
Warning: These citations may not always be 100% accurate.