Gaya APA

Clausen, Staerke J., Knudsen, A.. (2009). SP 261-18 Nondestructive Testing of Cable Ducts in Concrete Columns and Walls Using the Impact-Echo Method . USA: American Concrete Institute.

Gaya Chicago

Clausen, Staerke J., Knudsen, A.. SP 261-18 Nondestructive Testing of Cable Ducts in Concrete Columns and Walls Using the Impact-Echo Method. USA: American Concrete Institute, 2009. Text.

Gaya MLA

Clausen, Staerke J., Knudsen, A.. SP 261-18 Nondestructive Testing of Cable Ducts in Concrete Columns and Walls Using the Impact-Echo Method. USA: American Concrete Institute, 2009. Text.

Gaya Turabian

Clausen, Staerke J., Knudsen, A.. SP 261-18 Nondestructive Testing of Cable Ducts in Concrete Columns and Walls Using the Impact-Echo Method. USA: American Concrete Institute, 2009. Print.