APA (7th ed.) Citation

Widengren, G. (1967). Helmer, Professor Dr. Geo Widengren Sexagenarius.

Chicago Style (17th ed.) Citation

Widengren, Geo. Helmer, Professor Dr. Geo Widengren Sexagenarius. 1967.

MLA (8th ed.) Citation

Widengren, Geo. Helmer, Professor Dr. Geo Widengren Sexagenarius. 1967.

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