| 11. | Many of his books form the standard reference works on the subject.
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| 12. | This paper is one of the most referenced works on the subject.
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| 13. | The 750 illustrations, most in color, make this an inviting reference work.
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| 14. | This book continues to be a standard reference work on electoral systems.
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| 15. | These reference works often present these move sequences in simple endgame strategy.
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| 16. | Yet another edition of this reference work is due in a few years.
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| 17. | Many of his writings still serve as standard legal reference works.
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| 18. | Source : The Negro Almanac : A Reference Work on the African American
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| 19. | Most reference works on CD are tame, pale copies of their pulp brethren.
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| 20. | But the usefulness of the series as a reference work had been declining.
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