If you have use a particular collection, add the name of that collection.
e.g.: World Database of Happiness, Bibliography of Happiness
If you refer to a particular section in a collection, mention that section as well.
e.g.: World Database of Happiness, Happiness in nations, Rank Report 2006-1
e.g.: World Database of Happiness, Correlational Findings, Findings on Happiness and Age: subject code A4
e.g.: World Database of Happiness, States of Nations, Variable Corruption2_96
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