Hrachev, O. O., Etokov, V. I., Etokova, V. I., & Kukhtenko, T. O. (2011). Main Fields of Action of the NAS of Ukraine in Searching For Solutions to Problems of Rational Use of Nature and Environmental Protection in Ukraine (early 70's — early 90's of XX century, historical aspect).
Чикаго стиль цитування (17-те видання)Hrachev, O. O., V. I. Etokov, V. I. Etokova, та T. O. Kukhtenko. Main Fields of Action of the NAS of Ukraine in Searching For Solutions to Problems of Rational Use of Nature and Environmental Protection in Ukraine (early 70's — Early 90's of XX Century, Historical Aspect). 2011.
Стиль цитування MLA (8-ме видання)Hrachev, O. O., et al. Main Fields of Action of the NAS of Ukraine in Searching For Solutions to Problems of Rational Use of Nature and Environmental Protection in Ukraine (early 70's — Early 90's of XX Century, Historical Aspect). 2011.