Secondary Reference Material. Secondary standards or working standards are also high purity grade materials which are quantified in relation to primary standards and put to routine use in laboratories. Written by experts they address the subject from a historical or critical perspective.
Written by experts they address the subject from a historical or critical perspective. Textbooks edited works books and articles that interpret or review research works histories biographies literary criticism and interpretation reviews of law and legislation political analyses and commentaries. Secondary sources citation within citation sometimes an author writes about research that someone else has done but you are unable to track down the original research document.
Such working standards are assigned a limited validity depending on stability of the material and before expiry fresh working standards should be prepared for future use.
Examples of secondary sources. Secondary materials provide commentary analysis and discussion of a primary event idea or work. Examples of secondary sources. Secondary sources citation within citation sometimes an author writes about research that someone else has done but you are unable to track down the original research document.
