APA (7th ed.) Citation

Ostasiewicz, S., & Ostasiewicz, K. On the optimal purchasing the life insurance.

Chicago Style (17th ed.) Citation

Ostasiewicz, Stanisława, and Katarzyna Ostasiewicz. On the Optimal Purchasing the Life Insurance.

MLA (9th ed.) Citation

Ostasiewicz, Stanisława, and Katarzyna Ostasiewicz. On the Optimal Purchasing the Life Insurance.

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