Final answer:
The study mentioned in the question is from the book 'On All Frontiers: Four Centuries of Canadian Nursing' and it indicates that only 4% of nurses were cited in a study of 20,000 articles published.
Step-by-step explanation:
The study mentioned in the question is from the book On All Frontiers: Four Centuries of Canadian Nursing. The book, edited by Christina Bates, Dianne Dodd, and Nicole Rousseau, explores the history of nursing in Canada. It indicates that only 4% of nurses were cited in a study of 20,000 articles published.