APA način citiranja

Viera, C. J., Kopsell, E., Beer, J., Jiménez Otárola, F., & Lok, R. (1999). Forestry incentives to establish and manage timber trees in coffee fields.

Čikaški stil citiranja

Viera, Carlos J., Edgar Kopsell, John Beer, Francisco Jiménez Otárola, i Rosanna Lok. Forestry Incentives to Establish and Manage Timber Trees in Coffee Fields. 1999.

MLA način citiranja

Viera, Carlos J., et al. Forestry Incentives to Establish and Manage Timber Trees in Coffee Fields. 1999.