APA (7th ed.) Citation

Järvelin, K. (1986). User charge estimation in numeric online databases.

Chicago Style (17th ed.) Citation

Järvelin, Kalervo. User Charge Estimation in Numeric Online Databases. Tampere, 1986.

MLA (9th ed.) Citation

Järvelin, Kalervo. User Charge Estimation in Numeric Online Databases. 1986.

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