APA-čujuhus (7. p.)

Theis, T., & Tomkin, J. (2015). Sustainability: A Comprehensive Foundation. OpenStax CNX.

Chicago-čujuhus (17. p.)

Theis, Tom, juo Jonathan Tomkin. Sustainability: A Comprehensive Foundation. [Place of publication not identified]: OpenStax CNX, 2015.

MLA-čujuhus (9. p.)

Theis, Tom, juo Jonathan Tomkin. Sustainability: A Comprehensive Foundation. OpenStax CNX, 2015.

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