APA (7th ed.) Citation

Geological Survey (U.S.) & Water Resources Council (U.S.). (1988). Hydrologic unit map--1988, states of Massachusetts, Rhode Island, and Connecticut. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Water Resources Council (U.S.). Hydrologic Unit Map--1988, States of Massachusetts, Rhode Island, and Connecticut. Reston, Va.: The Survey, 1988.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Water Resources Council (U.S.). Hydrologic Unit Map--1988, States of Massachusetts, Rhode Island, and Connecticut. The Survey, 1988.