APA (7th ed.) Citation

(1931). Helgoland - Heiligland: 1/2. Helgoland - Heiligland.

Chicago Style (17th ed.) Citation

"Helgoland - Heiligland: 1/2." Helgoland - Heiligland 1931.

MLA (8th ed.) Citation

"Helgoland - Heiligland: 1/2." Helgoland - Heiligland, 1931.

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