Bg 2.8 P ORIGINAL:

...they can achieve real happiness only if they consult
Krsna, or the Bhagavad-gita and Srimad-Bhagavatam--which constitute
the science of
Krsna--or the
bona fide representative of Krsna, the man in Krsna consciousness.

Bg 2.8 P REVISED & ENLARGED:

...they can achieve real happiness only if they consult Krsna, or the
Bhagavad-gita and Srimad-Bhagavatam--which constitute the science
of Krsna--through the bona fide representative
of Krsna, the man in Krsna consciousness.