APA (7th ed.) Citation

(1943). Keep smiling!: [1]. Frit Nordisk Forlag.

Chicago Style (17th ed.) Citation

Keep Smiling!: [1]. [s.l.]: Frit Nordisk Forlag, 1943.

MLA (8th ed.) Citation

Keep Smiling!: [1]. Frit Nordisk Forlag, 1943.

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