APA-referens (7:e uppl.)

Hancock, H. I. The Young Engineers in Colorado; Or, At Railroad Building in Earnest.

Chicago-referens (17:e uppl.)

Hancock, H. Irving. The Young Engineers in Colorado; Or, At Railroad Building in Earnest.

MLA-referens (9:e uppl.)

Hancock, H. Irving. The Young Engineers in Colorado; Or, At Railroad Building in Earnest.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.