APA (7th ed.) Citation

A. Gafa, A. H. (2008). Keyword indexing for text documents using signature files / Abdul Hakim A. Gafa.

Chicago Style (17th ed.) Citation

A. Gafa, Abdul Hakim. Keyword Indexing for Text Documents Using Signature Files / Abdul Hakim A. Gafa. 2008.

MLA (9th ed.) Citation

A. Gafa, Abdul Hakim. Keyword Indexing for Text Documents Using Signature Files / Abdul Hakim A. Gafa. 2008.

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