Problems, exercises, etc English language 51 Textbooks for foreign speakers 25 Study and teaching 22 Foreign speakers 17 Grammar 16 Report writing 6 Rhetoric 6 College readers 3 Employees 3 Leadership 3 Training of 3 Case studies 2 Customer service 2 Economics 2 Interpersonal relations 2 Management 2 Mathematics 2 Personnel management 2 Problems, exercise, etc 2 Psychological aspects 2 Science 2 Self-instruction 2 Sound recordings for English speakers 2 Statistics 2 Textbook for foreigners 2 Textbooks of foreign speakers 2 Accounting engagements 1 Age factors 1 Aging 1