APA (7th ed.) Citation

Lipthay, T., Hrnčiar, P., & Held, Ľ. One of the possibilities of classification for problem tasks in organic chemistry.

Chicago Style (17th ed.) Citation

Lipthay, Tibor, Pavol Hrnčiar, and Ľubomír Held. One of the Possibilities of Classification for Problem Tasks in Organic Chemistry.

MLA (9th ed.) Citation

Lipthay, Tibor, et al. One of the Possibilities of Classification for Problem Tasks in Organic Chemistry.