Selk, J. (2018). Executive toughness: The mental-training program to increase your leadership performance (Updated edition.). McGraw-Hill Education.
Цитирование в стиле Чикаго (17-е изд.)Selk, Jason. Executive Toughness: The Mental-training Program to Increase Your Leadership Performance. Updated edition. New York: McGraw-Hill Education, 2018.
Цитирование MLA (8-е изд.)Selk, Jason. Executive Toughness: The Mental-training Program to Increase Your Leadership Performance. Updated edition. McGraw-Hill Education, 2018.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.