Dissertations, Academic 1,001 Dissertations 983 History 72 Politics and government 64 Sales (Islamic law) 51 Study and teaching 49 Economic conditions 43 United States 42 Islam 41 Foreign relations 39 English language 38 Wages 38 Social conditions 36 Education 32 Psychological aspects 31 Religious aspects 31 Mathematical models 30 Social aspects 29 Women 29 Attitudes 27 Conditional sales (Islamic law) 25 Economic aspects 24 Electromagnetic waves 24 Management 24 Research 23 Contracts (Islamic law) 22 Prices 22 Job satisfaction 21 Leadership 20 Time management 20