APA (7th ed.) Citation

Šály, V., Lelák, J., Packa, J., Váry, M., & Perný, M. Photovoltaic Energy Sources.

Chicago Style (17th ed.) Citation

Šály, Vladimír, Jaroslav Lelák, Juraj Packa, Michal Váry, and Milan Perný. Photovoltaic Energy Sources.

MLA (9th ed.) Citation

Šály, Vladimír, et al. Photovoltaic Energy Sources.

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