APA (7th ed.) Citation

Grenfell, D. R. Telephone message / David Rhys Grenfell ; Walter Citrine.

Chicago Style (17th ed.) Citation

Grenfell, D. R. Telephone Message / David Rhys Grenfell ; Walter Citrine.

MLA (8th ed.) Citation

Grenfell, D. R. Telephone Message / David Rhys Grenfell ; Walter Citrine.

Warning: These citations may not always be 100% accurate.