APA (7th ed.) Citation

Question Mark Computing Limited. (1999). Question Mark perception authoring manual. Question Mark Computing Ltd.

Chicago Style (17th ed.) Citation

Question Mark Computing Limited. Question Mark Perception Authoring Manual. Stamford, CT: Question Mark Computing Ltd, 1999.

MLA (9th ed.) Citation

Question Mark Computing Limited. Question Mark Perception Authoring Manual. Question Mark Computing Ltd, 1999.

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