- Author: Helen Whitwell, Katy Thorne, Alexander Kolar, Paul Harvey
- Language: English
- Year: 2023
- Author: Pavel Kolar
- Language: English
- Author: Susan Lendroth, Bob Kolar
- Language: English
- Year: 2018
- Author: Susan Lendroth, Bob Kolar
- Language: English
- Year: 2020
- Author: Marijan J. Kolar
- Language: Serbian
- Year: 1991
- Author: František Kolar, Ludmila Lezhneva
- Language: English
- Year: 1986
- Author: Patrik Kolar
- Language: Slovene
- Year: 2002
- Author: Patrik Kolar
- Language: Slovene
- Year: 2002
- Author: Gonzalo Oscar, Kolar Petr, Möhring Hans-Christian, Wiederkehr Petra
- Language: English
- Year: 2018