Annotated bibliography represents a summary of the resources to be used in research or study. Annotations help in defending various arguments in the study.A good researcher clearly understands his or her sources and chooses them wisely so they can make their arguments within the genuine and valid. This services includes; a brief summary of source ( 2 sentences or more); purpose of the study; significance of the study to the current research as well as the limitations/drawbacks of the source. Usually annotations are between100-150 words and they can be more or less depending on the instructions. Work can be completed within a few hours and even a day depending on the urgency.