APA (7th ed.) Citation

Philippine Press Institute. (1969). Clear effective writing: A PPI manual. Philippine Press Institute and Philippine Airlines.

Chicago Style (17th ed.) Citation

Philippine Press Institute. Clear Effective Writing: A PPI Manual. [Manila]: Philippine Press Institute and Philippine Airlines, 1969.

MLA (9th ed.) Citation

Philippine Press Institute. Clear Effective Writing: A PPI Manual. Philippine Press Institute and Philippine Airlines, 1969.

Warning: These citations may not always be 100% accurate.