APA (7th ed.) Citation

Valko, L. Professor Vojtech Kellö - an Octogenarian.

Chicago Style (17th ed.) Citation

Valko, Ladislav. Professor Vojtech Kellö - an Octogenarian.

MLA (9th ed.) Citation

Valko, Ladislav. Professor Vojtech Kellö - an Octogenarian.

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