A crucial and indispensable source of news and information, absolutely.
He called Garber's an indispensable source of fixtures for the historic brownstone he owns nearby.
Nevertheless, legal experts and policymakers interested in climate change will find this book an indispensable source.
The Tone River is an indispensable source of water for irrigation throughout its populous drainage basin.
— Paul, New Jersey A. The Times is an indispensable source of quality information.
In any company, in-house documents are an indispensable source of information for production.
This collection is an indispensable source of information for researchers in biochemistry, biotechnology, organic and analytical chemistry, and food sciences.
Accounting for almost 40 percent of the world's vegetable oils, it is an indispensable source of vitamins and calories.
Testing the vibration behaviour of present vehicles is an indispensable source of knowledge for further improvement of vehicle dynamics.
For more than two centuries, newspapers have been the indispensable source of public information and a check on the abuses of government and other powerful interests.
As jobs in the professoriate have disappeared, graduate students have become an indispensable source of labor, without whom undergraduates simply could not be taught.
