Extensive research has failed to uncover even a single reference by Obama to Alinsky.

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At all times important information, such as driving directions and the name of a song or radio station is kept at the top of the screen so the driver always has a single reference point.

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Less fancifully, the Human Microbiome Project is in the stage the human genome project was a decade ago, when all that was really available was a single reference genome built from the DNA of anonymous volunteers.

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There is no single reference here.

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The whole idea of replacing the watch with a band that acts as a mobile computer would be interesting, for the very fact that it would replace the real estate (our wrists) once used for a single point of reference on time.

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Web development is an inherently messy business in which a single web page is composed through reference to many individual CSS and Javascript files.

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We called the company ourselves, just before its entire site was replaced by the single-page statement, eliminating any reference to a phone number.

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Although it's an easy term of reference, nanotechnology is not a single technology.

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