I'm determining the soil texture through Soil Texture Triangle but no idea about the reference of the applied method, please do put your suggestion regarding the reference.
Indeed, this is a 3-phase diagram, consisting of "Sand", "Clay" and "Salt" as the main phase constituents of this 3-phase diagram. It's application is not complicated, but at first the validity of application of this diagram for the specified type of soil shall be re-checked and verified.
You may refer to diagram via:https://www.google.com/search?q=soil+triangle&rlz=1C1CHBD_enIR977IR977&sxsrf=ALiCzsYEeirlqO4rmP8AgsxARvCGLFAdoA:1653965442605&tbm=isch&source=iu&ictx=1&vet=1&fir=is-u0tMjcMSG-M%252Cil8HeUVWnR5UbM%252C%252Fm%252F0b9s8p%253BZ950rPtxSSOgIM%252CLbIuDlMEqjf7jM%252C_%253BtbPLW3hptACzgM%252C6kgZA9KBXGZ8rM%252C_%253B9ulLFk4dOxnJ-M%252CIYQN9jP02J_GGM%252C_%253BniuZZDaJXCBs5M%252CMlrwd_N0b3RfLM%252C_%253B5JRSntMAOgJeCM%252Cb8PZjgldh005XM%252C_%253B36xvs55jRgZpeM%252CmRFmAjQ7oqNoiM%252C_&usg=AI4_-kRKdF4gjuByYN1EwAj8OaaUyrHG5A&sa=X&ved=2ahUKEwjrhLW13Yj4AhVNIMUKHSgnA1sQ_B16BAhcEAE#imgrc=is-u0tMjcMSG-M