Gaya APA

Pettigrew, C, S. et al (2016). Behavior of 48-Year-Old Double-Tee Bridge Girders Made with Lightweight Concrete . Amerika: ASCE Library.

Gaya MLA

Pettigrew, Christopher, S.. et al. "Behavior of 48-Year-Old Double-Tee Bridge Girders Made with Lightweight Concrete". Amerika: ASCE Library, 2016. Text.