APA (7th ed.) Citation

Sidney Schafer & Associates. (1975). Index map showing Gulf of Mexico offshore gravity survey. Sidney Schafer & Associates.

Chicago Style (17th ed.) Citation

Sidney Schafer & Associates. Index Map Showing Gulf of Mexico Offshore Gravity Survey. Houston, Tex.: Sidney Schafer & Associates, 1975.

MLA (9th ed.) Citation

Sidney Schafer & Associates. Index Map Showing Gulf of Mexico Offshore Gravity Survey. Sidney Schafer & Associates, 1975.