Παραπομπή σε μορφή APA (7η εκδ.)

Hellers, B. G. (1973). Columns with and without tensile strength: An extension of theories used for the comparison of deflections, rotations, stresses and stability. National Swedish Institute for Building Research.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hellers, Bo Göran. Columns with and Without Tensile Strength: An Extension of Theories Used for the Comparison of Deflections, Rotations, Stresses and Stability. Stockholm: National Swedish Institute for Building Research, 1973.

Παραπομπή σε μορφή MLA (8th εκδ.)

Hellers, Bo Göran. Columns with and Without Tensile Strength: An Extension of Theories Used for the Comparison of Deflections, Rotations, Stresses and Stability. National Swedish Institute for Building Research, 1973.