APA-viite (7. p.)

Gottlob, G., Kolaitis, P., & Schwentick, T. (2000). Existential Second−Order Logic over Graphs: Charting the Tractability Frontier.

Chicago-viite (17. p.)

Gottlob, G., P. Kolaitis, ja T. Schwentick. Existential Second−Order Logic over Graphs: Charting the Tractability Frontier. 2000.

MLA-viite (9. p.)

Gottlob, G., et al. Existential Second−Order Logic over Graphs: Charting the Tractability Frontier. 2000.