किसने कहा था, 'दबाव समूह ऐसे अभिवृत्ति समूह (एटीट्यूड ग्रुप्स) हैं जो समाज के अन्य समूहों पर कुछ दावे करते हैं'?

Who among the following ancient thinkers is considered the father of comparative politics for systematically studying Greek city-state constitutions?

Arend Lijphart is best known for which of the following political theories?