APA (7th ed.) Citation

Christensen, C. (1973). Index filicum: Supplementum I-III, 1906-1933. Otto Koeltz Antiquariat.

Chicago Style (17th ed.) Citation

Christensen, Carl. Index Filicum: Supplementum I-III, 1906-1933. Koenigstein: Otto Koeltz Antiquariat, 1973.

MLA (9th ed.) Citation

Christensen, Carl. Index Filicum: Supplementum I-III, 1906-1933. Otto Koeltz Antiquariat, 1973.

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