APA

Skagen S. K., Knopf F. L., .Toward conservation of midcontinental shorebird migrations. : .

Chicago

Skagen Susan K, Knopf Fritz L, .Toward conservation of midcontinental shorebird migrations. : .

Harvard

Skagen S. K., Knopf F. L., .Toward conservation of midcontinental shorebird migrations. : .

MLA

Skagen Susan K, Knopf Fritz L, .: . .