APA

Neeley F., Heguy D., Karr J., Gas Technology Products, Heguy D., Karr J. & Gas Technology Products. (200). Sulfur: At the crossroads of energy, the environment, and agriculture. Schaumburg: Gas Technology Products.

Chicago

Neeley Ferrell, Heguy Doug, Karr Jess, Gas Technology Products, Heguy Doug, Karr Jess and Gas Technology Products. 200. Sulfur: At the crossroads of energy, the environment, and agriculture. Schaumburg: Gas Technology Products.

Harvard

Neeley F., Heguy D., Karr J., Gas Technology Products, Heguy D., Karr J. and Gas Technology Products. (200). Sulfur: At the crossroads of energy, the environment, and agriculture. Schaumburg: Gas Technology Products.

MLA

Neeley Ferrell, Heguy Doug, Karr Jess, Gas Technology Products, Heguy Doug, Karr Jess and Gas Technology Products. Sulfur: At the crossroads of energy, the environment, and agriculture. Schaumburg: Gas Technology Products. 200.