APA

Jelen Bill, Alexander M. & APN Promise. (2019). Microsoft Excel 2019. Warszawa: APN Promise.

Chicago

Jelen Bill, Alexander Michael and APN Promise. 2019. Microsoft Excel 2019. Warszawa: APN Promise.

Harvard

Jelen Bill, Alexander M. and APN Promise. (2019). Microsoft Excel 2019. Warszawa: APN Promise.

MLA

Jelen Bill, Alexander Michael and APN Promise. Microsoft Excel 2019. Warszawa: APN Promise. 2019.