George Engelmann: Printed works 1831-1883.
Tohutoru Kātū Chicago (17th ed.)George Engelmann: Printed Works 1831-1883.
Tohutoro MLA (9th ed.)George Engelmann: Printed Works 1831-1883.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.
Tohutoro APA (7th ed.)