APA (7th ed.) Citation

Simmons, J. L. (1987). Traveltime inversion for a 3-D near surface velocity model. [publisher not identified].

Chicago Style (17th ed.) Citation

Simmons, James Layton. Traveltime Inversion for a 3-D Near Surface Velocity Model. [Place of publication not identified]: [publisher not identified], 1987.

MLA (9th ed.) Citation

Simmons, James Layton. Traveltime Inversion for a 3-D Near Surface Velocity Model. [publisher not identified], 1987.