APA

Laursan H., .Structural analysis. New York :Mcgraw hill ,2014: .

Chicago

Laursan Harold, .Structural analysis. New York :Mcgraw hill ,2014: .

Harvard

Laursan H., .Structural analysis. New York :Mcgraw hill ,2014: .

MLA

Laursan Harold, .New York :Mcgraw hill ,2014: . .