APA (7th ed.) Citation

(1998). Collins electronic english dictionary & thesaurus. HarperCollins.

Chicago Style (17th ed.) Citation

Collins Electronic English Dictionary & Thesaurus. HarperCollins, 1998.

MLA (8th ed.) Citation

Collins Electronic English Dictionary & Thesaurus. HarperCollins, 1998.

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