United States. National Transportation Safety Board. (1988). Commercial emergency medical service helicopter operations. The Board ; [Available to the public through the National Technical Information Service].
Chicago Style (17th ed.) CitationUnited States. National Transportation Safety Board. Commercial Emergency Medical Service Helicopter Operations. Washington, D.C. : [Springfield, Va.]: The Board ; [Available to the public through the National Technical Information Service], 1988.
MLA (9th ed.) CitationUnited States. National Transportation Safety Board. Commercial Emergency Medical Service Helicopter Operations. The Board ; [Available to the public through the National Technical Information Service], 1988.
Warning: These citations may not always be 100% accurate.