APA (7th ed.) Citation

Listrovoj, S. V., & Listrovaja, E. S. (2018). Substantiation of the hypothesis on four colors.

Chicago Style (17th ed.) Citation

Listrovoj, S. V., and E. S. Listrovaja. Substantiation of the Hypothesis on Four Colors. 2018.

MLA (8th ed.) Citation

Listrovoj, S. V., and E. S. Listrovaja. Substantiation of the Hypothesis on Four Colors. 2018.

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