APA (7th ed.) Citation

Hessenberg, G. (1934). Trigonometra plana y esfØrica (3“ ed.). Labor.

Chicago Style (17th ed.) Citation

Hessenberg, Gerhard. Trigonometra Plana Y EsfØrica. 3“ ed. Barcelona [etc.]: Labor, 1934.

MLA (9th ed.) Citation

Hessenberg, Gerhard. Trigonometra Plana Y EsfØrica. 3“ ed. Labor, 1934.

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