Παραπομπή APA

Rebers, M. (1994). Gibberellins and the cold requirement of tulip. Bulb Research Centre.

Παραπομπή Chicago Style

Rebers, Mariken. Gibberellins and the Cold Requirement of Tulip. Netherlands: Bulb Research Centre, 1994.

Παραπομπή MLA

Rebers, Mariken. Gibberellins and the Cold Requirement of Tulip. Bulb Research Centre, 1994.