Cita APA (7th ed.)

Petkutė, R. (2012). English for sustainable environment: Study book. Technika.

Cita Chicago (17th ed.)

Petkutė, Rūta. English for Sustainable Environment: Study Book. Vilnius: Technika, 2012.

Cita MLA (9th ed.)

Petkutė, Rūta. English for Sustainable Environment: Study Book. Technika, 2012.