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The lowest v = 0 level of the A(1)Pi s a e of the (CO)-C-13-O-16 sotopologue of carbon monoxide has been reinvestigated with a variety crf high-resolution spectroscopic techniques. The A(1)Pi-X-1 Sigma(+)(0, 0) band has been studied by vacuum-ultraviolet Fourier-transform absorption spectroscopy, using the SOLEIL synchrotron as a radiation source. Spectra were obtained under quasi-static gas conditions at liquid nitrogen temperature, room temperature arid at an elevated temperature of 900 K, with absolute accuracies of 0,01-0,03 cm(-1), Two-photon Doppler-free laser spectroscopy has been applied to a irnited number of transitions in the A(1)Pi-X-1 Sigma(+)(0, 0) band, under collision-free circumstances of a olecular beam, yielding an absolute accuracy of 0.002 cm(-1). The third technique is high-resolution ouner transform emission spectroscopy in the visible region applied to the B-1 Sigma(+)-A(1)Pi(0, 0) band in a gas discharge, at an absolute accuracy of up to 0.003 cm(-1). With these methods, rotational levels of A(1)Pi (0) could be studied in both parity components up to a rotational quantum number of J =46, The frequencies of 397 transitions were used to analyse the perturbations betvveen the A(1)Pi(0) level by vibrational levels of the D-1 Delta, e(3)Sigma(-), d(3)Delta, and a’E-3(+) states.