Freitag, R., & Bradley, M. C. (2006). Biographical Sources in the Sciences--Life, Earth and Physical Sciences (1989-2006). LC Science Tracer Bullet. TB 06-4.
Citazione stile Chigago Style (17a edizione)Freitag, Ruth, e Michelle Cadoree Bradley. Biographical Sources in the Sciences--Life, Earth and Physical Sciences (1989-2006). LC Science Tracer Bullet. TB 06-4. 2006.
Citatione MLA (9a ed.)Freitag, Ruth, e Michelle Cadoree Bradley. Biographical Sources in the Sciences--Life, Earth and Physical Sciences (1989-2006). LC Science Tracer Bullet. TB 06-4. 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.