What has the author William H Butterfield written?

William H. Butterfield has written:

'Practical problems in business correspondence' -- subject(s): Problems, exercises, Commercial correspondence

'Effective personal letters' -- subject(s): Interpersonal communication, Letter writing

'The business letter in modern form' -- subject(s): Commercial correspondence

'How to use letters in college public relations' -- subject(s): Publicity, Letter writing, Universities and colleges