It is important to use as guidelines for educational or historical practice of historical will be applied with prudence careful. Not to be biased and to achieve reliability.
It is important to use as a guide for the study of history. Or historical practice can be used with prudence and caution to ensure impartiality and credibility.
It is important to use as a guideline for the study of history. Rain or coaching historical will be used carefully. Carefully, objectively and to achieve reliability.