B2Bridge

Wikipedia gives a good definition of business marketing as:

Business marketing is the practice of organizations, including commercial businesses, governments and institutions, facilitating the sale of their products or services to other companies or organizations that in turn resell them, use them as components in products or services they offer, or use them to support their operations. Also known as industrial marketing, business marketing is also called business-to-business marketing, or b-to-b marketing, for short.

It also references some major articles and books.

Worthwhile reading.