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2. ACI Committee 318 (1989). Building code requirements for reinforced concrete (ACI 318-89), American Concrete Institute, Farmington Hills, MI, p. 1–4.
3. ACI Committee 318 (2011). Building code requirements for structural concrete and commentary (ACI 318M-08), American Concrete Institute, Farmington Hills, p. 4–3.
4. AIJ (1998). Standard for structural design and construction of prestressed concrete structures, Architectural Institute of Japan, p. 4–4.
5. ASTM C39 (2010). Standard test method for compressive strength of cylindrical concrete specimens, ASTM C39M-14a, Annu Book ASTM Stand 04. 02, p. 7.