APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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