APA   Click to copy
Cao, B., McNaughton, J., Vogel, C. R., & Willden, R. H. J. Hydrodynamic Design of Multi-Rotor Tidal Arrays.

Chicago/Turabian   Click to copy
Cao, B., J. McNaughton, C. R. Vogel, and R. H. J. Willden. “Hydrodynamic Design of Multi-Rotor Tidal Arrays,” n.d.

MLA   Click to copy
Cao, B., et al. Hydrodynamic Design of Multi-Rotor Tidal Arrays.

@unpublished{cao-a,
  title = {Hydrodynamic Design of Multi-Rotor Tidal Arrays},
  author = {Cao, B. and McNaughton, J. and Vogel, C. R. and Willden, R. H. J.}
}