APA (7th ed.) Citation

Wewetzer, A., Krall, S., & Schulz, F. A. (1993). Methods for the assessment of crop losses due to grasshoppers and locusts. GTZ.

Chicago Style (17th ed.) Citation

Wewetzer, A., S. Krall, and F. A. Schulz. Methods for the Assessment of Crop Losses Due to Grasshoppers and Locusts. Eschborn: GTZ, 1993.

MLA (9th ed.) Citation

Wewetzer, A., et al. Methods for the Assessment of Crop Losses Due to Grasshoppers and Locusts. GTZ, 1993.